Install AutoCAD 2000i on Windows 11

Follow these instructions to solve issues around installing/running your legacy AutoCAD 2000i on Windows 11

Ransomware Protection Windows 11 and AutoCAD

Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

How to install AutoCAD 2000i

A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…
  1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
  2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
  3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
  4. Start the Longbow Converter tool
    1. Insert your AutoCAD 2000 CD into your CDRom drive
    2. Select the 2nd tab named “Old AutoCAD Installer Reviver
    3. Using the “…” button, pick your AutoCAD CD
    4. Click “Run Old Installer
      1. Read and follow all the prompts
      2. Once the AutoCAD setup starts, stop and read the next step…
  5. In the AutoCAD setup program, navigate through each setup dialog as normal, with these exceptions…
    1. When you arrive at the installation folder path setup dialog…
      1. **it’s vitally important to make sure you install to c:\acad2000i (not Program Files (x86)\AutoCAD  2000i which is normally default)**
      2. Once setup completes…
        1. Do not reboot if asked to do so
        2. Make sure to fully close the setup program when the installation is complete.
  6. Back in the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab, it should say SUCCESS!
  7. Finally, reboot your PC and run your AutoCAD!

Installing the AutoCAD 2000i sp2 service pack

  1. download the locked AutoCAD 2000i sp2 from here or download the unlocked AutoCAD 2000i sp2 from here
  2. Next, unzip and save the service pack file to c:\Autodesk\sp – do not install yet
  3. Go back into the Converter, select the 3rd tab, select the c:\Autodesk\sp folder and click Fix.
  4. Install the 2000i sp2 by running either the c:\Autodesk\sp\u090_u181p.exe for unlocked or c:\Autodesk\sp\u090_u181p_swl.exe for locked
  5. Once your sp is installed, start the Longbow Converter tool again; we are going to repeat some of the steps from the original installation before. Select the 2nd tab, pick the copy of your AutoCAD 2000i CD on your hard drive which last time was in c:\Autodesk\acad2000i folder, now select the 3rd tab, select the install folder c:\acad2000i now click Fix.
  6. Now, you can happily run your AutoCAD 2000i with sp2 on Windows 10, Windows 7 and Windows 8.

Troubleshooting

 

Copyright 2024 (c) Longbow Software

Installing 32bit AutoCAD 2016 on Windows 11

These instructions solve issues around installing/running your 32bit AutoCAD 2016 on 64bit Windows 11. Some common issues are error messages like these

  • “This operating system is not supported by AutoCAD® 2016”
  • “You cannot install this product on the current operating system”
  • “You are attempting to use a 32-bit installer on a 64-bit operating system”
  • “This is a 32-bit AutoCAD® 2016. It cannot be installed on 64-bit Windows”
  • FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD 2016\acismobj20.dbx

You can solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD 2016 installation so that you can be up and running again… Follow these instructions:

Ransomware Protection Windows 11 and AutoCAD

Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders – here’s how

How to install AutoCAD 2016

  1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
  2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
  3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
  4. Obtain your purchased copy of the Longbow Converter here
  5. Start the Converter App and note the user interface
  6. Select the 1st tab named “AutoCAD 32bit Installer Converter
    1. Using the “. . .” button, selection your AutoCAD installation CD
    2. Next, click the “Convert button and follow instructions
  7. Once the conversion process is complete
    1. click Install/Run Setup to start setup
    2. Simply install as normal, remembering to…
      1. Close the setup program when the installation is complete.
      2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
  8. Now run your AutoCAD as normal

Troubleshooting

  1. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
Copyright 2024 (c) Longbow Software

AutoCAD/AutoCAD LT 2014, 2015 and 2016 on Windows 11 – random crashes on startup/open

Affecting all versions of AutoCAD and AutoCAD LT 2014, 2015 and 2016

Random shutdown on startup or opening of DWG files. AutoCAD may restart after a few attempts. You see errors like:

Unhandled Exception 4 (Access violation reading 0x0014) at address 70DC63A9h

Unhandled Exception 4 (Access violation reading 0x0014) at address 70DC63A9h

 

 

 

 

 

 

Additional error texts:

  • INTERNAL ERROR: Attempt to register class ‘AcViewNavigation’ twice
  • Error handler re-entered. Exiting now.

Issues are caused by the forced shutdown of AutoCAD components. You can fix the problem using the Longbow Converter App (you need version 12.61 or newer), steps to fix are as follows:

  1. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
  2. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
  3. Start the Longbow Converter tool
    1. Select the 3nd tab named “Old AutoCAD Program Reviver
    2. Using the “” button
      1. pick the path to your acad.exe file (or for AutoCAD LT it’s acadlt.exe) 
        1. TIP: you can find the path by right-clicking the AutoCAD shortcut, clicking Properties and noting the ‘Target’ property e.g. C:\Program Files\Autodesk\AutoCAD 2016
    3. Click “Fix Old Program
  4. Now start AutoCAD. problem should now be solved. If not, please contact Longbow Support

Copyright 2024 (c) Longbow Software

Installing Autodesk Mechanical Desktop 4 on Windows 11

Installing Autodesk Mechanical Desktop R4 on Windows 11 is not normally possible, you will run into lots of problems including the error message shown below…

Windows 16bit setup error - This app can't run on your PC

Windows 16bit setup error – This app can’t run on your PC

The following document will walk you through how to install your Autodesk Mechanical Desktop R4 (otherwise known as MDT 4 and built on the AutoCAD 2000 platform) on Windows 11 32bit or 64bit…

Ransomware Protection Windows 11 and AutoCAD

Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

How to install AutoCAD MDT R4 (2000)

A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…

  1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
  2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
  3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
  4. Start the Longbow Converter tool
    1. Insert your AutoCAD CD into your CDRom drive
    2. Select the 2nd tab named “Old AutoCAD Installer Reviver
    3. Using the “…” button, pick your AutoCAD CD
    4. Click “Run Old Installer
      1. Read and follow all the prompts
      2. Once the AutoCAD setup starts, stop and read the next step…
  5. In the setup program, navigate through each setup dialog as normal, except when you get to the installation folder, **it’s vitally important to make sure you install to c:\mdt2000 (not .\MDT as usually prompted)**

    MDT 4 select the Browse button

    MDT 4 select the Browse button and update path to c:\mdt2000   MDT 4 Select Install path to c:\mdt2000

     

  6. Now carry on with the install, please read all of the following tips while your installation is running so that you are prepared…
    1. Do not reboot once the install is complete.
    2. Ignore any errors related to not being able to create the shortcut folder “Mechanical Desktop 4”, you will have to create a shortcut on your computer Desktop pointing to your c:\mdt2000\acad.exe by hand.
    3. If you see errors stating errors with objectdbx.z or dao2535.tlb – please reboot your machine and re-do all of the steps above.
    4. Once you click “OK” to setup not being able to create your shortcut folder “Mechanical Desktop 4” – setup may now try to install Acrobat Reader 3.01. If this happens, you will see a blue Mechanical Desktop 4 screen with nothing on it, it will sit there for maybe 60 minutes, just let it do its thing and be patient. Eventually, you will see the Acrobat setup appear, install accepting all defaults.
    5. When the MDT 4 setup asks if you want to “Install the Mechanical Desktop Migration Assistant” say
  7. Once the setup has completed…
      1. Do not reboot if asked to do so
      2. Make sure to fully close the setup program when the installation is complete.
      3. Back in the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab and that SUCCESS!! is displayed
  8. Finally, reboot your PC.
    1. Now you are ready to run your AutoCAD, simply run c:\mdt2000\acad.exe using Windows Explorer.
  9. If you find that you are running in raw AutoCAD mode, to enable your Mechanical Desktop features, carry out these next steps, either…
    1. Add a shortcut (recommended) to c:\mdt2000\acad.exe making sure that the Target Property of the shortcut is set to (including quotes) “C:\mdt2000\acad.exe”  /p “C:\mdt2000\desktop\desktop.arg” and the Start In Property is set to the same path as the .arg file e.g.

      Creating a shortcut to Mechanical R4

      Creating a shortcut to Mechanical R4 making sure the Startin property points to where the .arg file resides

      1. For the Power Packs use a new shortcut with the Target set to either
        1. “C:\mdt2000\acad.exe”  /p “C:\mdt2000\acadm\mdtpp.arg”
        2. “C:\mdt2000\acad.exe”  /p “C:\mdt2000\acadm\acadmpp.arg”
          …with both Shortcut Start In: properties set to and the C:\mdt2000\acadm
    2. or update your AutoCAD support path by hand…
      1. At the AutoCAD Command line, type the command ‘Preferences’, add new Support path folders c:\mdt2000\acadm and then also c:\mdt2000\acadm\support, now click ‘Apply’ and then ‘OK’ out of the dialog.
      2. Next, restart AutoCAD.
      3. When you are back in AutoCAD, type ‘Menuload’ at the command line, click browse, then navigate to C:\mdt2000\acadm\support, change the file filter at the bottom to *.mnu, then open acadm.mnu, finally click Load, then pick Close.
      4. Now restart AutoCAD
  10. Now you can happily run your Autodesk Mechanical Desktop 4 – but we do recommend you install the following Service Packs…

Installing AutoCAD 2000 Service Pack 1

  1. Obtain AutoCAD 2000 sp1
  2. Unzip your newly downloaded sp to folder path c:\Autodesk\sp
  3. Start the Converter, select the 2nd tab named “Old AutoCAD Installer Reviver“,
    1. pick the c:\Autodesk\sp\AutoCAD 2000 sp1 folder and click ‘Run Old Installer
  4. Wait for the setup to appear, it could take up to 45 minutes, then install as normal

Installing AutoCAD 2000 Service Pack 2

  1. Obtain AutoCAD 2000 sp2
  2. Unzip your newly downloaded sp to folder path c:\Autodesk\sp
  3. Start the Converter, select the 2nd tab named “Old AutoCAD Installer Reviver“,
    1. pick the c:\Autodesk\sp\AutoCAD 2000 sp2 folder and click ‘Run Old Installer
  4. Wait for the setup to appear, it could take up to 45 minutes, then install as normal.

Installing AutoCAD 2000 Service Pack 3

  1. Obtain the AutoCAD MDT R4 sp 3
  2. Unzip your newly downloaded sp to folder path c:\Autodesk\sp
  3. Start the Converter, select the 2nd tab named “Old AutoCAD Installer Reviver“,
    1. pick the c:\Autodesk\sp\AutoCAD 2000 sp3 folder and click ‘Run Old Installer
  4. Wait for the setup to appear, it could take up to 45 minutes, then install as normal.

Installing AutoCAD 2000 Service Pack 4a

  1. Obtain the AutoCAD MDT R4 sp 4a
  2. Unzip your newly downloaded sp to folder path c:\Autodesk\sp
  3. Start the Converter, select the 2nd tab named “Old AutoCAD Installer Reviver“,
    1. pick the c:\Autodesk\sp\AutoCAD 2000 sp4 folder and click ‘Run Old Installer
  4. Wait for the setup to appear, it could take up to 45 minutes, then install as normal.

Troubleshooting

Copyright 2024 (c) Longbow Software

Installing Autodesk Land Desktop 2002 (LDT 2002) on Windows 11

Follow these instructions to solve issues around installing/running your legacy AutoCAD LDT 2002 on Windows 11. It requires the purchase of our Longbow Converter App which provides the framework to allow your old AutoCAD to install and run natively on Windows 11.

NOTE: We currently only support US unlocked versions of 2002 on 64bit OS. European or locked US support 2002 is limited only to 32bit Windows 11.

Ransomware Protection Windows 11 and AutoCAD

Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

How to install Autodesk LDT 2002

  1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
  2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
  3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
  4. This image has an empty alt attribute; its file name is ProblemSolved-1.pngStart the Longbow Converter tool
    1. Select the 2nd tab named “Old AutoCAD Installer Reviver
    2. Using the “. . .” button, pick your LDT 2002 CD ROM
      1. Now click the “Run Old Installer” button
      2. Next, just follow the Converter’s instructions.
    3. Once the AutoCAD setup starts, stop and read the next step
  5. In the setup program, navigate through each setup dialog as normal, except when you get to the installation folder **it’s vitally important to make sure you install to c:\ldt2002 (not Program Files (x86)\Autodesk Land Desktop 3 as usually prompted by default)**
    1. Now carry on with the install as usual
    2. Do not reboot if asked to do so
  6. Once installed…
    1. Be sure to completely close the setup application
    2. Now go back to the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab, it should say “SUCCESS!!”
    3. Finally, reboot your PC and run your AutoCAD as normal
  7. Now you can happily run your LDT 2002!

Installing LDT 3 Service Packs

You must first install sp1, followed by sp2…

LDT 3 sp1 – software lock/unlocked with html documentation

LDT 3 sp2 – software lock/unlocked with html documentation 

  1. Unzip the sp1 into a folder called c:\Autodesk\LDT3 sp1
  2. Next, start the Converter, select the 3rd tab “Old AutoCAD Program Reviver” select the c:\Autodesk\LDT3 sp1 folder, then click Fix.
    1. If asked if this is a service pack by the Converter tool, say yes.
  3. Now run the sp1 as you need from Windows Explorer.
  4. Repeat for sp2

Installing Civil Design 3

Using the Longbow Converter solution, you can also install the Civil Design add-on to LDT 3.

  1. Using Windows Explorer, copy your entire Civil Design 3 CD to your hard drive, to a folder path c:\Autodesk\ldt2002 – Civil Design 3 
  2. Start the Longbow Converter tool, select the 2nd tab, pick the c:\Autodesk\ldt2002 – Civil Design 3 folder, and click Run. Read and understand all the prompts before pressing OK. Once the setup starts, stop and read the next step…
  3. In the setup program, navigate through each setup dialog as normal
  4. Now your Civil Design 3 is up and running with LDT.

Installing Survey 3

Using the Longbow Converter solution, you can also install the Survey add-on to LDT 3.

  1. Using Windows Explorer, copy your entire Survey 3 CD to your hard drive, to a folder path c:\Autodesk\ldt2002 – Survey 3 
  2. Start the Longbow Converter tool, select the 2nd tab, pick the c:\Autodesk\ldt2002 – Survey 3 folder, and click Run. Read and understand all the prompts before pressing OK. Once the setup starts, stop and read the next step…
  3. In the setup program, navigate through each setup dialog as normal
  4. Now your Survey 3 is up and running with LDT.

Installing Raster Design 3

Using the Longbow Converter solution, you can also install the Raster Design add-on to LDT 3.

  1. Using Windows Explorer, copy your entire Survey 3 CD to your hard drive, to a folder path c:\Autodesk\ldt2002 – Raster Design 3 
  2. Start the Longbow Converter tool, select the 2nd tab, pick the c:\Autodesk\ldt2002 – Raster Design 3 folder, and click Run. Read and understand all the prompts before pressing OK. Once the setup starts, stop and read the next step…
  3. In the setup program, navigate through each setup dialog as normal
  4. Now your Raster Design 3 is up and running with LDT.

Troubleshooting

– If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

Copyright 2024 (c) Longbow Software

Installing AutoCAD Architectural Desktop (ADT R14) on Windows 11

As an existing AutoCAD Architectural Desktop (ADT R14) User, you most likely cannot do without your beloved AutoCAD ADT. With the latest hardware and required move to new Windows versions, trying to install your AutoCAD gives an error like this one…

Windows 16bit setup error - This app can't run on your PC
Windows 16bit setup error – This app can’t run on your PC

or

 “FATAL ERROR: HEAP ERROR”

or

MEM_BAD_POINTER

…all is not lost, follow these instructions to install your ADT R14 on Windows 11…

 

Ransomware Protection Windows 11 and AutoCAD

Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

 

How to install AutoCAD ADT R14

A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…

  • If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
  • Copyright 2024 (c) Longbow Software

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

  • Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)
  • Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

  • When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
  • Once your AutoCAD setup has completed the installation…
      1. Make sure you fully close the setup program.
      2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
    1. Now reboot your PC

  • Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)
  • Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

  • navigate through each setup dialog as normal, with these exceptions…
    1. Make sure you do a Typical Install (not a Full Install)
    2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD Architectural Desktop’“, you will have to create a shortcut on your computer Desktop to your c:\adtR14\acad.exe by hand.
      3. Again, do not reboot if prompted to do so

    2. Once your AutoCAD setup has completed the installation…
        1. Make sure you fully close the setup program.
        2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      1. Now reboot your PC

    3. Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)

    Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

    1. navigate through each setup dialog as normal, with these exceptions…
      1. Make sure you do a Typical Install (not a Full Install)
      2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD Architectural Desktop’“, you will have to create a shortcut on your computer Desktop to your c:\adtR14\acad.exe by hand.
      3. Again, do not reboot if prompted to do so

    2. Once your AutoCAD setup has completed the installation…
        1. Make sure you fully close the setup program.
        2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      1. Now reboot your PC

    3. Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)

    Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

  • In the AutoCAD setup program…
    1. navigate through each setup dialog as normal, with these exceptions…
      1. Make sure you do a Typical Install (not a Full Install)
      2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD Architectural Desktop’“, you will have to create a shortcut on your computer Desktop to your c:\adtR14\acad.exe by hand.
      3. Again, do not reboot if prompted to do so

    2. Once your AutoCAD setup has completed the installation…
        1. Make sure you fully close the setup program.
        2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      1. Now reboot your PC

    3. Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)

    Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

  • In the AutoCAD setup program…
    1. navigate through each setup dialog as normal, with these exceptions…
      1. Make sure you do a Typical Install (not a Full Install)
      2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD Architectural Desktop’“, you will have to create a shortcut on your computer Desktop to your c:\adtR14\acad.exe by hand.
      3. Again, do not reboot if prompted to do so

    2. Once your AutoCAD setup has completed the installation…
        1. Make sure you fully close the setup program.
        2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      1. Now reboot your PC

    3. Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)

    Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

    1. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter

    2. Once installed, start the Longbow Converter App…

      1. Now place your AutoCAD ADT R14 CD in the CDRom Drive
      2. In the Converter App, select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “. . .” button, select your AutoCAD installation CD
      4. Next, click the “Run Old Installer” button and follow the onscreen instructions. If all is well a dialog will appear stating success, simply click OK to start your AutoCAD setup
        1. Now I know it’s unheard of these days, but at this point expect to wait up to 45 minutes for your AutoCAD setup.exe program to appear, be patient – NOTE: do not continue with the install until reading the next step…
      5. Once the setup starts, stop and read the next steps all the way to the end! By the way, if your AutoCAD ADT R14 setup does not start after 45 minutes, read the Troubleshooting section below.

    3. In the AutoCAD setup program…
      1. navigate through each setup dialog as normal, with these exceptions…
        1. Make sure you do a Typical Install (not a Full Install)
        2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD Architectural Desktop’“, you will have to create a shortcut on your computer Desktop to your c:\adtR14\acad.exe by hand.
      3. Again, do not reboot if prompted to do so

    2. Once your AutoCAD setup has completed the installation…
        1. Make sure you fully close the setup program.
        2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      1. Now reboot your PC

    3. Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)

    Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.

    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and click OK
    1. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter

    2. Once installed, start the Longbow Converter App…

      1. Now place your AutoCAD ADT R14 CD in the CDRom Drive
      2. In the Converter App, select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “. . .” button, select your AutoCAD installation CD
      4. Next, click the “Run Old Installer” button and follow the onscreen instructions. If all is well a dialog will appear stating success, simply click OK to start your AutoCAD setup
        1. Now I know it’s unheard of these days, but at this point expect to wait up to 45 minutes for your AutoCAD setup.exe program to appear, be patient – NOTE: do not continue with the install until reading the next step…
      5. Once the setup starts, stop and read the next steps all the way to the end! By the way, if your AutoCAD ADT R14 setup does not start after 45 minutes, read the Troubleshooting section below.

    3. In the AutoCAD setup program…
      1. navigate through each setup dialog as normal, with these exceptions…
        1. Make sure you do a Typical Install (not a Full Install)
        2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\adtR14 (not Program Files\AutoCAD Architectural Desktop as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD Architectural Desktop’“, you will have to create a shortcut on your computer Desktop to your c:\adtR14\acad.exe by hand.
      3. Again, do not reboot if prompted to do so

    2. Once your AutoCAD setup has completed the installation…
        1. Make sure you fully close the setup program.
        2. Once the setup is closed the Converter will automatically fix the newly installed program files for you automatically (inside folder c:\adtR14). You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      1. Now reboot your PC

    3. Once rebooted, you can now run your AutoCAD ADT R14, using Windows Explorer, navigate to c:\adtR14 and double click acad.exe (we recommend creating a Desktop shortcut for easy access)

    Troubleshooting

    1. If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing R14 from Windows Safe Mode
    2. If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD R14 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadR14 as stated in step (7) above.
    3. When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    4. If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    5. Issues with Calcomp Digitizer – Calcomp Digitizer not working
    6. If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    7. Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadr14
        6. Click “Fix Old Program” and follow prompts
    8. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2024 (c) Longbow Software

    AutoCAD LT 2014 on Windows 11 – FATAL ERROR: acismobj20.dbx

    If you are running AutoCAD LT 2014 on Windows 11 and you receive this error…

    FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD LT 2014\acismobj20.dbx

    The issue is that you are running 64bit AutoCAD LT 2014 on Windows 11, this is an old version of AutoCAD which is easily affected by Windows Updates pushed by Microsoft. You need to install the 32bit version of AutoCAD LT 2014 instead as it is not as easily affected by the latest Windows components. To solve the problem, you must first uninstall your existing AutoCAD LT 2014 (do not install along side as it will not work) and then follow these instructions to install the 32bit version (which is much more reliable and actually runs faster)

    Copyright 2024 (c) Longbow Software

    Install 32bit AutoCAD 2019 on Windows 11

    These instructions solve issues around installing/running your 32bit AutoCAD 2019 on 64bit Windows 11. Some common issues are error messages like these

    • “This operating system is not supported by AutoCAD® 2019”
    • “You cannot install this product on the current operating system”
    • “You are attempting to use a 32-bit installer on a 64-bit operating system”
    • “This is a 32-bit AutoCAD® 2019. It cannot be installed on 64-bit Windows”

    You can solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD 2019 installation so that you can be up and running again… Follow these instructions:

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 2019

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Obtain your purchased copy of the Longbow Converter here
    5. Start the Converter App and note the user interface
    6. Select the 1st tab named “AutoCAD 32bit Installer Converter
      1. Using the “. . .” button, selection your AutoCAD installation CD
      2. Next, click the “Convert button and follow instructions
    7. Once the conversion process is complete
      1. click Install/Run Setup to start setup
      2. Simply install as normal, remembering to…
        1. Close the setup program when the installation is complete.
        2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
    8. Now run your AutoCAD as normal

    Troubleshooting

    1. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2024 (c) Longbow Software

    Installing 32bit AutoCAD LT 2014 on Windows 11

    These instructions solve issues around installing/running your old AutoCAD 2014 on 64bit Windows 11. Some common issues are error messages like these

    • “This operating system is not supported by AutoCAD LT® 2014”
    • “You cannot install this product on the current operating system”
    • “You are attempting to use a 32-bit installer on a 64-bit operating system”
    • “This is a 32-bit AutoCAD LT® 2014. It cannot be installed on 64-bit Windows”
    • FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD LT 2014\acismobj20.dbx

    You can automatically solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD LT 2014 installation so that you can be up and running again… Follow these instructions:

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 2014

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Obtain your purchased copy of the Longbow Converter here
    5. Start the Converter App and note the user interface
    6. Select the 1st tab named “AutoCAD 32bit Installer Converter
      1. Using the “. . .” button, selection your AutoCAD installation CD
      2. Next, click the “Convert button and follow instructions
    7. Once the conversion process is complete
      1. click Install/Run Setup to start setup
      2. Simply install as normal, remembering to…
        1. Close the setup program when the installation is complete.
        2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
    8. Now run your AutoCAD as normal

    Troubleshooting

    1. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2024 (c) Longbow Software

    Install AutoCAD 2002 on Windows 11

    Follow these instructions to solve issues around installing/running your legacy AutoCAD 2002 on Windows 11

    Ransomware Protection Windows 11 and AutoCAD

    Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD 2002

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…
    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Start the Longbow Converter tool
      1. Insert your AutoCAD 2002 CD into your CDRom drive
      2. Select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “…” button, pick your AutoCAD CD
      4. Click “Run Old Installer
        1. Read and follow all the prompts
        2. Once the AutoCAD setup starts, stop and read the next step…
    5. In the AutoCAD setup program, navigate through each setup dialog as normal, with these exceptions…
      1. When you arrive at the installation folder path setup dialog…
        1. **it’s vitally important to make sure you install to c:\acad2002 (not Program Files (x86)\AutoCAD  2002 which is normally default)**
        2. Once setup completes…
          1. Do not reboot if asked to do so
          2. Make sure to fully close the setup program when the installation is complete.
    6. Back in the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab, it should say SUCCESS!
    7. Finally, reboot your PC and run your AutoCAD and once registered, exit AutoCAD and continue to the next step.
    8. Next, obtain the AutoCAD 2002 sp1 from here unzip and save to c:\Autodesk\spdo not install yet
      1. Go back into the Converter
      2. Select the 3rd tab again
      3. titled “Old AutoCAD Program Reviver
      4. Using the ‘…’ button, select the c:\Autodesk\sp folder
      5. click “Fix Old Program
      6. Finally, install the AutoCAD 2002 sp1 by running the c:\Autodesk\sp\acad2002sp1.exe 
    9. Now, you can happily run your AutoCAD 2002 on Windows 11

    Troubleshooting

    • If your AutoCAD 2002 setup stuck at very end, check out this blog
    • If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD 
    Copyright 2023 (c) Longbow Software

    Installing AutoCAD LT98 on Windows 11

    AutoCAD LT98 users are very used to the software package and cannot do without it. With the latest hardware and required move to new Windows versions, trying to install your AutoCAD LT98 gives an error like this one…

    Windows 16bit setup error - This app can't run on your PC

     

    “This app can’t run on your PC”

    or this one…

    Setup Halted System requirements error Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98
    “Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98”

     

    …all is not lost, follow these instructions to install your AutoCAD LT98 on Windows 11…

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 98

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any

    problems…

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    1. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    2. Once installed, start the Longbow Converter App…
      1. Now place your AutoCAD LT98 CD in the CDRom Drive
      2. In the Converter App, select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “. . .” button, select your AutoCAD LT98 installation CD
      4. Next, click the “Run Old Installer” button and follow the onscreen instructions. If all is well a dialog will appear stating success, simply click OK to start your AutoCAD setup
        1. Now I know it’s unheard of these days, but at this point expect to wait up to 45 minutes for your AutoCAD LT98 setup.exe program to appear, be patient – NOTE: do not continue with the install until reading the next step…
      1. Once the setup starts, stop and read the next steps all the way to the end! By the way, if your AutoCAD LT98 setup does not start after 45 minutes, read the Troubleshooting section below.
    3. In the AutoCAD setup program…
      1. navigate through each setup dialog as normal, with these exceptions…
        1. Make sure you do a Typical Install (not a Full Install)
        2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\acadlt98 (not Program Files\AutoCADLT98 as usually prompted)**
    4. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD LT98’“, you will have to create a shortcut on your computer Desktop to your c:\acadlt98\acad.exe by hand.
      3. Again, do not reboot if prompted to do so
    5. Once your AutoCAD LT98 setup has completed the installation…
      1. Make sure you fully close the setup program.
      2. Once the setup is closed the Converter will automatically fix the c:\acadlt98 program files. You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      3. Now reboot your PC
    6. You can now run your AutoCAD LT98 as normal, using Windows Explorer, navigate to c:\acadlt98 and double click aclt.exe

    Troubleshooting

    • If your AutoCAD LT98 setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing LT98 from Windows Safe Mode
    • If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD LT98 then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadlt98 as stated in step (7) above.
    • When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computer. Try reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    • If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    • Issues with Calcomp Digitizer – Calcomp Digitizer not working
    • If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    • Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadlt98
        6. Click “Fix Old Program” and follow prompts
    • If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2023 (c) Longbow Software

    Installing Autodesk Land Desktop 2004 on Windows 11

    Follow these instructions to solve issues around installing/running your legacy AutoCAD LDT 2004 on Windows 11. It requires the purchase of our Longbow Converter App which provides the framework to allow your old AutoCAD to install and run natively on Windows 11.

    NOTE: We currently only support US unlocked versions of 2004 on 64bit OS. European or locked US support 2004 is limited only to 32bit Windows 11.

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install Autodesk LDT 2004

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Start the Longbow Converter tool
      1. Insert your AutoCAD CD into your CDRom drive
      2. Select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “…” button, path the to your AutoCAD CD
      4. Click “Run Old Installer
        1. Read and follow all the prompts
        2. Once the AutoCAD setup starts, stop and read the next step…
    5. In the AutoCAD setup program, navigate through each setup dialog as normal, with these exceptions…
      1. Some problem NOTES to read before stepping through the setup:
        1. if you cannot move past the first screen in the setup, see Trouble Shooting below
        2. When you click the Install link from your AutoCAD setup you may see a dialog box appear saying – “This program has compatibility issues” – simply check the “Don’t show this message again” and then click the “Run the program without getting help”.
        3. Now onto the setup…
      2. When you arrive at the installation folder path setup dialog…
        1. **it’s vitally important to make sure you install to c:\ldt2004 (not Program Files (x86)\Autodesk Land Desktop 2004)**.
      3. While installing…
        1. If you see an error in install “.NET Runtime Optimization Service has stopped working” – simply ignore by clicking the “Close Program” button
        2. Do not reboot if asked to do so
      4. Once installed
        1. Do not reboot if asked to do so
        2. Make sure to fully close the setup program when the installation is complete.
        3. Back in the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab
    6. Finally, reboot your PC and run your AutoCAD as normal
      1. NOTE: When starting AutoCAD, if you see a warning dialog when you run saying “This program has known compatibility issues
        1. Click “Don’t show this message again”
        2. then click “Run the Program…”

    Installing Civil Design 4

    Using the Longbow Converter solution, you can also install the Civil Design add-on to LDT.

    1. Using Windows Explorer, copy your entire Civil Design 4 CD to your hard drive, to a folder path c:\Autodesk\ldt2004 – Civil Design 4 
    2. Start the Longbow Converter tool, select the 2nd tab, pick the c:\Autodesk\ldt2004 – Civil Design 4 folder, and click Run.
      1. The Converter will ask if this is a normal application CD, it is not, it’s a plugin CD so click ‘No’
      2. Input Civil 2004 and click OK
      3. Read and understand all the prompts before pressing OK.
    3. In the setup program, navigate through each setup dialog as normal
    4. Now your Civil Design is up and running with LDT.

    Installing Survey 4

    Using the Longbow Converter solution, you can also install the Survey add-on to LDT.

    1. Using Windows Explorer, copy your entire Survey 4 CD to your hard drive, to a folder path c:\Autodesk\ldt2002 – Survey 4 
    2. Start the Longbow Converter tool, select the 2nd tab, pick the c:\Autodesk\ldt2002 – Survey 4 folder, and click Run.
      1. The Converter will ask if this is a normal application CD, it is not, it’s a plugin CD so click ‘No’
      2. Input Survey 2004 and click OK
      3. Read and understand all the prompts before pressing OK.
    3. In the setup program, navigate through each setup dialog as normal
    4. Now your Survey is up and running with LDT.

    Installing Raster Design 3

    Using the Longbow Converter solution, you can also install the Raster Design add-on to LDT.

    1. Using Windows Explorer, copy your entire Raster Design 4 CD to your hard drive, to a folder path c:\Autodesk\ldt2002 – Raster Design 4 
    2. Start the Longbow Converter tool, select the 2nd tab, pick the c:\Autodesk\ldt2002 – Raster Design 4 folder, and click Run.
      1. The Converter will ask if this is a normal application CD, it is not, it’s a plugin CD so click ‘No’
      2. Input Plugin 2004 and click OK
      3. Read and understand all the prompts before pressing OK.
    3. In the setup program, navigate through each setup dialog as normal
    4. Now your Raster Design is up and running with LDT.

    Installing Autodesk LDT 2004 Sp2

    The LDT 2004 sp2 is optional, most users don’t need it but in case you do…

    1. Download LDT 2004 sp2 from here 
      1. Copy the file into c:\Autodesk\sp
    2. Start the Converter
      1. Select the 3rd tab named “Old AutoCAD Program Reviver
      2. Pick the c:\Autodesk\sp folder
      3. Now click the Fix Old Program button.
      4. Install as normal

    Troubleshooting

    – If you are unable to activate your product, or the activation process crashes immediately on startup:

    – If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2023 (c) Longbow Software

    Installing 32bit AutoCAD 2010 on Windows 11

    These instructions solve issues around installing/running your old AutoCAD 2010 on 64bit Windows 11. Some common issues are error messages like these

    • “This operating system is not supported by AutoCAD® 2010”
    • “You cannot install this product on the current operating system”
    • “You are attempting to use a 32-bit installer on a 64-bit operating system”
    • “This is a 32-bit AutoCAD® 2010. It cannot be installed on 64-bit Windows”

    You can automatically solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD 2010 installation so that you can be up and running again… Simply follow the instructions below:

    IMPORTANT NOTE: Autodesk no longer supply License Activation codes for this version of AutoCAD. The best way is to transfer your existing license to the new PC but there are other options, we document them here

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD 2010

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Start the Converter App and note the user interface
    5. Select the 1st tab named “AutoCAD 32bit Installer Converter
      1. Using the “. . .” button, selection your AutoCAD installation CD
      2. Next, click the “Convert button and follow instructions
    6. Once the conversion process is complete
      1. click Install/Run Setup to start setup
        1. if you see a dialog stating “An App on your PC needs the following Windows Feature: .NET Framework 3.5 (includes .NET 2.0 and 3.0)” be sure to click “Download and install this feature” as this must be installed in order for the setup to run.
      2. Simply install as normal, remembering to…
        1. Close the setup program when the installation is complete.
        2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
    7. Now run your AutoCAD as normal

    Installing AutoCAD 2010 Service Packs

    We recommend that you download and install the latest Service Packs from Autodesk which can be found here

    Troubleshooting

    1. If your AutoCAD crashes while interacting with the Ribbon click here
    2. If you are unable to activate your product, or the activation process crashes:
      1. Try uninstalling the July 2014 Microsoft security update
      2. Try downgrading your Internet Explorer (IE) from version 11 to version 10 by following the instructions detailed here
    3. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2023 (c) Longbow Software

    AutoCAD LT 2016 on Windows 11 – FATAL ERROR: acismobj20.dbx

    If you are running AutoCAD LT 2016 on Windows 11 and you receive this error…

    fmvandevoort_0-1664878147378.png

    The issue is that you are running 64bit AutoCAD LT 2016 on Windows 11, this is an old version of AutoCAD which is easily affected by Windows Updates pushed by Microsoft. You need to install the 32bit version of AutoCAD LT 2016 instead as it is not as easily affected by the latest Windows components. To solve the problem, you must first uninstall your existing AutoCAD LT 2016 (do not install along side as it will not work) and then follow these instructions to install the 32bit version (which is much more reliable and actually runs faster)

    Copyright 2023 (c) Longbow Software

    Installing 32bit AutoCAD LT 2016 on Windows 11

    These instructions solve issues around installing/running your 32bit AutoCAD 2016 on 64bit Windows 11. Some common issues are error messages like these

    • “This operating system is not supported by AutoCAD LT® 2016”
    • “You cannot install this product on the current operating system”
    • “You are attempting to use a 32-bit installer on a 64-bit operating system”
    • “This is a 32-bit AutoCAD LT® 2016. It cannot be installed on 64-bit Windows”
    • FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD LT 2016\acismobj20.dbx

    You can solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD LT 2016 installation so that you can be up and running again… Follow these instructions:

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders – here’s how

    How to install AutoCAD LT 2016

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Obtain your purchased copy of the Longbow Converter here
    5. Start the Converter App and note the user interface
    6. Select the 1st tab named “AutoCAD 32bit Installer Converter
      1. Using the “. . .” button, selection your AutoCAD installation CD
      2. Next, click the “Convert button and follow instructions
    7. Once the conversion process is complete
      1. click Install/Run Setup to start setup
      2. Simply install as normal, remembering to…
        1. Close the setup program when the installation is complete.
        2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
    8. Now run your AutoCAD as normal

    Troubleshooting

    1. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2023 (c) Longbow Software

    AutoCAD LT 2015 on Windows 11 – FATAL ERROR: acismobj20.dbx

    If you are running AutoCAD LT 2015 on Windows 11 and you receive this error…

    FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD LT 2015\acismobj20.dbx

    The issue is that you are running 64bit AutoCAD LT 2015 on Windows 11, this is an old version of AutoCAD which is easily affected by Windows Updates pushed by Microsoft. You need to install the 32bit version of AutoCAD LT 2015 instead as it is not as easily affected by the latest Windows components. To solve the problem, you must first uninstall your existing AutoCAD LT 2015 (do not install along side as it will not work) and then follow these instructions to install the 32bit version (which is much more reliable and actually runs faster)

    Copyright 2023 (c) Longbow Software

    Installing 32bit AutoCAD LT 2015 on Windows 11

    These instructions solve issues around installing/running your old AutoCAD 2015 on 64bit Windows 11. Some common issues are error messages like these

    • “This operating system is not supported by AutoCAD LT® 2015”
    • “You cannot install this product on the current operating system”
    • “You are attempting to use a 32-bit installer on a 64-bit operating system”
    • “This is a 32-bit AutoCAD LT® 2015. It cannot be installed on 64-bit Windows”
    • FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD LT 2015\acismobj20.dbx

    You can automatically solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD LT 2015 installation so that you can be up and running again… Follow these instructions:

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 2015

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Obtain your purchased copy of the Longbow Converter here
    5. Start the Converter App and note the user interface
    6. Select the 1st tab named “AutoCAD 32bit Installer Converter
      1. Using the “. . .” button, selection your AutoCAD installation CD
      2. Next, click the “Convert button and follow instructions
    7. Once the conversion process is complete
      1. click Install/Run Setup to start setup
      2. Simply install as normal, remembering to…
        1. Close the setup program when the installation is complete.
        2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
    8. Now run your AutoCAD as normal

    Troubleshooting

    1. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2022 (c) Longbow Software

    Installing AutoCAD 2005 on Windows 11

    Follow these instructions to solve issues around installing/running your legacy AutoCAD 2005 on Windows 11

    IMPORTANT NOTE: Autodesk no longer supply License Activation codes for this version of AutoCAD. The best way is to transfer your existing license to the new PC but there are other options, we document them here

    Ransomware Protection Windows 11 and AutoCAD

    Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD 2005 

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…
    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Start the Longbow Converter tool
      1. Insert your AutoCAD 2005 CD into your CDRom drive
      2. Select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “…” button, pick your AutoCAD CD
      4. Click “Run Old Installer
        1. Read and follow all the prompts
        2. Once the AutoCAD setup starts, stop and read the next step…
    5. In the AutoCAD setup program, navigate through each setup dialog as normal, with these exceptions…
      1. When you arrive at the installation folder path setup dialog…
        1. **it’s vitally important to make sure you install to c:\acad2005 (not Program Files (x86)\AutoCAD 2005)**. Now install…
        2. While installing…
          1. If you see an error in install “.NET Runtime Optimization Service has stopped working” – simply ignore by clicking the “Close Program” button
          2. When a message box appears warning that “64bit .NET Unavailable” – simply click OK to carry on and install AutoCAD as normal – this does not affect anything.
          3. Do not reboot if asked to do so
        3. Once installed
          1. Do not reboot if asked to do so
          2. Make sure to fully close the setup program when the installation is complete.
          3. Switch back to the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should display “SUCCESS!” – if not switch to the “Old AutoCAD Program Reviver” tab, pick the c:\acad2005 folder and click “Fix Old Program”
    6. Finally, reboot your PC and run your AutoCAD as normal
      1. NOTE: When starting AutoCAD, if you see a warning dialog when you run saying “This program has known compatibility issues
        1. Click “Don’t show this message again
        2. then click “Run the Program…

    Installing AutoCAD 2005 Sp1

    To install the sp for your AutoCAD…
    1. Download your AutoCAD 2005 Sp1
    2. Copy the service pack exe installer to folder path c:\Autodesk\sp
    3. Start the Converter App
      1. select the 3rd tab named “Old AutoCAD Program Reviver
      2. Using the “. . .” button, pick the c:\Autodesk\sp folder
      3. click “Fix Old Program“.
    4. Now you can run the service pack exe installer from Windows explorer as normal

    Troubleshooting

    1. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2022 (c) Longbow Software

    Installing AutoCAD LT 2000 on Windows 11

    Most users of AutoCAD LT 2000 are so used to it that they cannot do without it. With the latest hardware and required move to newer Windows versions, trying to install your AutoCAD LT 2000 gives an error like this one…

    Windows 16bit setup error - This app can't run on your PC

    Windows 16bit setup error – This app can’t run on your PC

    Or maybe this error…

    Setup Halted System requirements error Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98

    Error while trying to install AutoCAD LT 2000 on newer versions of Windows

    …all is not lost, just read on…

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 2000

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…
    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Now, start the Longbow Converter tool by double clicking the Longbow Converter shortcut on your Desktop… .
      1. Insert your AutoCAD LT 2000 CD
      2. Select the 2nd tab titled “Old AutoCAD Installer Reviver” by clicking on it
      3. Next, using the ‘…’ button select your AutoCAD LT 2000 CD
      4. Next, click the “Run Old Installer” button and follow the onscreen instructions. If all is well a dialog will appear stating success, simply click OK to start your AutoCAD setup.
      5. Now, I know it’s unheard of these days, but at this point expect to wait at least 45 minutes for your AutoCAD 2000 setup.exe program to fully appear – please be patient
      6. Once the setup starts, stop and read the next step
    5. Once the AutoCAD setup program appears navigate through each setup dialog as normal and do not deviate from the defaults except when you get to the installation folder – **it’s vitally important to make sure you install to c:\acadlt2000 (not Program Files (x86)\AutoCAD LT 2000 as usually prompted)** e.g.Setting custom install path for AutoCAD LT 2000
        1. Now complete the setup making sure to…
          1. ignore the error message that appears near the end about the shortcut cannot be created “Cannot create folder AutoCAD LT 2000” – you will simply need to create the program shortcut yourself by hand once the installation is finished.
          2. Do not reboot if prompted to do so
    6. Once setup has completed…
      1. Make sure to fully close the AutoCAD setup program
      2. Back in the Converter App, make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should display “SUCCESS” in green…
    7. Now Reboot your PC
    8. Once rebooted, are ready to run your AutoCAD LT 2000! Simply use Windows Explorer, navigate to c:\acadlt2000 and double click aclt.exe

    Troubleshooting

    Copyright 2022 (c) Longbow Software

    Installing AutoCAD LT97 on Windows 11

    AutoCAD LT97 users are very used to the software package and cannot do without it. With the latest hardware and required move to new Windows versions, trying to install your AutoCAD LT97 gives an error like this one…
    Windows 16bit setup error - This app can't run on your PC

    “This app can’t run on your PC”

    or this one…
    Setup Halted System requirements error Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98
    “Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98” …all is not lost, follow these instructions to install your AutoCAD LT97 on Windows 11…

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT97

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any

    problems…

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    1. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    2. Once installed, start the Longbow Converter App…
      1. Now place your AutoCAD LT97 CD in the CDRom Drive
      2. In the Converter App, select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “. . .” button, select your AutoCAD LT97 installation CD
      4. Next, click the “Run Old Installer” button and follow the onscreen instructions. If all is well a dialog will appear stating success, simply click OK to start your AutoCAD setup
        1. Now I know it’s unheard of these days, but at this point expect to wait up to 45 minutes for your AutoCAD LT97 setup.exe program to appear, be patient – NOTE: do not continue with the install until reading the next step…
      5. Once the setup starts, stop and read the next steps all the way to the end! By the way, if your AutoCAD LT97 setup does not start after 45 minutes, read the Troubleshooting section below.
    3. In the AutoCAD setup program…
      1. navigate through each setup dialog as normal, with these exceptions…
        1. Make sure you do a Typical Install (not a Full Install)
        2. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\acadlt97 (not Program Files\AutoCADLT97 as usually prompted)**
    1. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD LT97’, you will have to create a shortcut on your computer Desktop to your c:\acadlt97\aclt.exe by hand.
      3. Again, do not reboot if prompted to do so
    2. Once your AutoCAD setup has completed the installation…
      1. Make sure you fully close the setup program.
      2. Once the setup is closed the Converter will automatically fix the c:\acadlt97 program files. You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      3. Now reboot your PC
    3. You can now run your AutoCAD LT97, using Windows Explorer, navigate to c:\acadlt97 and double click aclt.exe

    Troubleshooting

    • If your AutoCAD LT97 setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing LT97 from Windows Safe Mode
    • If you are getting an application failure with Unhandled Exception 0x800F0922
      • The security software (ESET Nod 32) must uninstalled; suspending it not effective
    • If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    Copyright 2022 (c) Longbow Software

    Installing AutoCAD LT 2002 on Windows 11

    If you are a seasoned AutoCAD LT 2002 user, no doubt you will at some point have run into the famous GEDIT 3 error and been very frustrated with it. That error occurs because of certain video card drivers and/or certain types of anti-virus software setups.

    On Windows 10, Windows 7 and Windows 8, the GEDIT 3 error is even more prominent because of all the new security features that are inside of Windows 7 and 8. The good news is that it’s totally possible to eradicate the GEDIT 3 error by follow the instructions below.
     

    Follow these instructions to solve issues around installing/running your legacy AutoCAD LT 2002 on Windows 11

    Ransomware Protection Windows 11 and AutoCAD

    Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 2002 

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…
    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Start the Longbow Converter tool
      1. Insert your AutoCAD LT 2002 CD into your CDRom drive
      2. Select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “…” button, pick your AutoCAD CD
      4. Click “Run Old Installer
        1. Read and follow all the prompts
        2. Once the AutoCAD setup starts, stop and read the next step…
    5. In the AutoCAD setup program, navigate through each setup dialog as normal, with these exceptions…
      1. When you arrive at the installation folder path setup dialog…
        1. **it’s vitally important to make sure you install to c:\acadlt2002 (not Program Files (x86)\AutoCAD LT 2002 which is normally default)** – e.g.

          You must change the default AutoCAD LT 2002 Install path
        2. Once setup completes…
          1. Do not reboot if asked to do so
          2. Make sure to fully close the setup program when the installation is complete.
    6. Back in the Converter app and make sure it’s completed the final stage of processing using the “Old AutoCAD Program Reviver” tab, it should say SUCCESS!
    7. Finally, reboot your PC and run your AutoCAD and once registered, exit AutoCAD and continue to the next step.
    8. Next, obtain the AutoCAD LT 2002 sp1 from here unzip and save to c:\Autodesk\spdo not install yet
    9. Next, obtain the AutoCAD LT 2002 sp2 from here (or AutoCAD LT 2002 sp2 locked version from here) and save to c:\Autodesk\sp do not install yet
    10. Go back into the Converter
      1. select the 3rd tab named “Old AutoCAD Program Reviver”
      2. Using the “. . .” button, select the c:\Autodesk\sp folder
      3. click “Fix Old Program“.
        1. Now Install the LT 2002 sp1 by running c:\Autodesk\sp\acad2002LTsp1.exe
          1. IMPORTANT NOTE: If you get a 114 error, contact Longbow Software Support to get them to fix it for you.
        2. Next, install the LT 2002 sp2 by running either the unlocked c:\Autodesk\sp\acltk044-k047unl.exe or the locked c:\Autodesk\sp\acltk044-k047swl.exe
          1. IMPORTANT NOTE: If you get a 114 error, contact Longbow Software Support to get them to fix it for you.
    1. Finally, reboot your PC and run AutoCAD as normal.

    Troubleshooting

    • If you cannot install your AutoCAD LT 2002 Service Packs because of an error “114: Autocad LT 2002 update was not applied” – rather than try and solve this issue, the easiest solution is:
      1. To go back to your old Windows XP machine and make sure that all of the sp’s are installed on your old Windows XP machine’s installation of AutoCAD LT 2002
      2. Next, simply copy all of the AutoCAD LT 2002 program files and folders from your old Windows XP machine to a USB drive – copy the “contents” of C:\Program Files\AutoCAD LT 2002
      3. Now transfer the USB to your new machine and copy the files that were on your old Windows XP machine’s C:\Program Files\AutoCAD LT 2002 folder into your newly installed c:\acadlt2002 folder – you should see a question if you should overwrite all files, say YES
    • If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2022 (c) Longbow Software

    Installing AutoCAD for Windows 95 (LT95) on Windows 11

    As an existing AutoCAD LT95 user, you most likely cannot do without your beloved AutoCAD. With the latest hardware and required move to new Windows versions, trying to install your AutoCAD LT95 gives an error like this one…

    Windows 16bit setup error - This app can't run on your PC

    “This app can’t run on your PC”

    or this one…

    Setup Halted System requirements error Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98
    “Wrong OS, AutoCAD supports Windows NT 4.0, Windows NT 5.0, Windows 95 and Windows 98”

    …all is not lost, follow these instructions to install your LT95 on Windows 11…

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT95

    A quick word of advice: please follow the instructions below precisely as documented including using the same folder names and paths. This will significantly reduce the risk of having any problems…

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    1. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    2. Once installed, start the Longbow Converter App…
      1. Now place your AutoCAD LT95 CD in the CDRom Drive
      2. In the Converter App, select the 2nd tab named “Old AutoCAD Installer Reviver
      3. Using the “. . .” button, select your AutoCAD LT95 installation CD
      4. Next, click the “Run Old Installer” button and follow the onscreen instructions. If all is well a dialog will appear stating success, simply click OK to start your AutoCAD setup
        1. Now I know it’s unheard of these days, but at this point expect to wait up to 45 minutes for your AutoCAD LT95 setup.exe program to appear, be patient – NOTE: do not continue with the install until reading the next step…
      5. Once the setup starts, stop and read the next steps all the way to the end! By the way, if your AutoCAD LT95 setup does not start after 45 minutes, read the Troubleshooting section below.
    3. In the AutoCAD LT95 setup program…
      1. navigate through each setup dialog as normal, with these exceptions…
      2. Make sure you do a Typical Install (not a Full Install)
      3. When you get to the installation folder input dialog **it’s vitally important to make sure you install to c:\acadLT95 (not Program Files\AutoCAD LT95 as usually prompted)**
    4. Now carry on with the install
      1. Do not reboot once the install is complete
      2. Ignore any errors related to not being able to create the shortcut e.g. “Cannot Create folder ‘AutoCAD LT95’“, you will have to create a shortcut on your computer Desktop to your c:\acadLT95\acad.exe by hand.
      3. Again, do not reboot if prompted to do so
    5. Once your AutoCAD LT95 setup has completed the installation…
      1. Make sure you fully close the setup program.
      2. Once the setup is closed the Converter will automatically fix the c:\acadLT95 program files. You should see “Success!” displayed in the 3rd tab named “Old AutoCAD Program Reviver
      3. Now reboot your PC
    6. You can now run your AutoCAD LT95, using Windows Explorer, navigate to c:\acadLT95 and double click aclt.exe

    Troubleshooting

    • If your AutoCAD setup is not starting after 45 minutes…
      1. First try turning off UAC, rebooting, then restart the steps above.
      2. If it is still failing, most likely it’s because of another application on your system which is preventing our setup routine from starting (perhaps anti-virus, or similar) – try installing LT95 from Windows Safe Mode
    • If you are getting either a Bad Mem Pointer error and or a Smartheap handler recursively re-entered error when you start your AutoCAD then you need to re-run all the steps above, taking care to do each step precisely as it says, most likely you are missing from step 5 or you have not installed to c:\acadLT95 as stated in step (7) above.
    • When starting AutoCAD, if you receive an ‘acad.exe – System Error’ message: The program can’t start because ac1st15.dll is missing from your computerTry reinstalling the program to fix this problem. If you carried out step (7) above, then try rebooting your PC
    • If you are getting a WinHelp() error when pressing F1 to try and access the Help system then simply install the WinHelp (WinHlp32.exe) module from Microsoft
    • Issues with Calcomp Digitizer – Calcomp Digitizer not working
    • If the setup displays an error message InstallError (IUO)               
      (X)  not enough space(IUO) try unplugging any External USB drives
    • Plotting issues? If you get an error splwow64.exe “The application was unable to start correctly” with error “0xc0000005”
      1. Make sure your Anti-virus and/or Windows Firewall is not blocking splwow64.exe
      2. If the problem persists
        1. First, note that you need the latest version of the Converter App
        2. Start the Converter App
        3. Select the 3d tab “Old AutoCAD Program Reviver” 
        4. Click the Tools Menu->Reduced Power Mode
        5. Using the “…” button, pick your acad.exe folder e.g. c:\acadLT95
        6. Click “Fix Old Program” and follow prompts
    • If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2022 (c) Longbow Software

    Installing 64bit AutoCAD LT 2016 on Windows 7, Windows 8 and Windows 10

    AutoCAD LT 2016 was not designed to run in Windows 10 (Windows 10 was released after AutoCAD LT 2016) and inevitably you will run into issues such as the infamous Ribbon crashing issue, slow startup problems, text scaling issues, etc.

    You can automatically solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD LT 2016 installation so that you can be up and running again… Just follow these easy instructions:

    How to install 64bit AutoCAD LT 2016

    1. First, uninstall any existing AutoCAD LT 2016 installations on your computer
    2. Next, obtain the Longbow Converter App download here
    3. Start the Converter tool
      1. Pick the 1st tab named “AutoCAD 32bit Installer Converter
      2. Using your mouse, right-click the tab text “AutoCAD 32bit Installer Converter” so that it changes to “AutoCAD 64bit Installer Converter
      3. Next, using the “. . .” button, select your AutoCAD installation CD and follow the instructions presented by the Converter tool user interface.
    4. Once the conversion process is complete
      1. click Install/Run Setup to start setup
      2. Once you have completed the AutoCAD installation process…
        1. Completely close the setup program
        2. Go back to the Converter App and make sure it states “Success!
    5. Now you can run your AutoCAD as normal

    Troubleshooting

    – If your AutoCAD is running really slowly, try disabling your integrated graphics card so you can run your high-performance card instead

    – If you are unable to activate your product, or the activation process crashes:

    – If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD

    Copyright 2022 (c) Longbow Software

    Windows Hangs on Start up after installing AutoCAD 2010

    After installing AutoCAD 2010 (or any of the vertical versions) the next reboot causes the computer to hang on start up; Windows gets to the welcome screen and freezes.

    Users have solved the issue like this:

    1. Reinstall Windows 10 (or 11)
    2. Install Longbow Converter App
      1. Install https://www.microsoft.com/en-us/download/details.aspx?id=26347
      2. Install https://www.microsoft.com/en-us/download/details.aspx?id=26368  
      3. Install https://www.microsoft.com/en-us/download/details.aspx?id=22  
    3. reboot PC
    4. Run Longbow and then install AutoCAD 2010 32bit using the Longbow Converter App (default install)
    5. Install again https://www.microsoft.com/en-us/download/details.aspx?id=26347
    6. Install again https://www.microsoft.com/en-us/download/details.aspx?id=26368  
    7. Install again https://www.microsoft.com/en-us/download/details.aspx?id=22  
    8. Reboot

    Copyright 2022 (c) Longbow Software

     

     

    Installing 32bit AutoCAD LT 2012 on Windows 11

    These instructions solve issues around installing/running your old AutoCAD 2012 on 64bit Windows 11. Some common issues are error messages like these

    • “This operating system is not supported by AutoCAD LT® 2012”
    • “You cannot install this product on the current operating system”
    • “You are attempting to use a 32-bit installer on a 64-bit operating system”
    • “This is a 32-bit AutoCAD LT® 2012. It cannot be installed on 64-bit Windows”

    You can automatically solve these problems using our Longbow Converter App, it fixes and manages the AutoCAD LT 2012 installation so that you can be up and running again… Follow these instructions:

    Ransomware Protection Windows 11 and AutoCAD

    Just before we start note that Windows 11 comes with a Ransomware Protection which includes Controlled Folder Access. Controlled folder access blocks applications from writing to your Documents, Pictures, Videos, Music, Public and Favorites folders. AutoCAD versions all the way to AutoCAD 2021 write to certain user Public folders and are therefore blocked by this feature. This can cause issues with all sorts of things including activating your AutoCAD license and even running AutoCAD. Ransomware Protection is an important feature of Windows 11 but it will affect your AutoCAD unless you allow AutoCAD and its dependent applications access to the controlled folders.

    How to install AutoCAD LT 2012

    1. If you don’t yet have a copy of the Longbow Converter App you can purchase it here or click on the download link we sent you via email in order to download the Converter App to your PC.
    2. Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
    3. Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
    4. Obtain your purchased copy of the Longbow Converter here
    5. Start the Converter App and note the user interface
    6. Select the 1st tab named “AutoCAD 32bit Installer Converter
      1. Using the “. . .” button, selection your AutoCAD installation CD
      2. Next, click the “Convert button and follow instructions
    7. Once the conversion process is complete
      1. click Install/Run Setup to start setup
        1. if you see a dialog stating “An App on your PC needs the following Windows Feature: .NET Framework 3.5 (includes .NET 2.0 and 3.0)” be sure to click “Download and install this feature” as this must be installed in order for the setup to run.
      2. Simply install as normal, remembering to…
        1. Close the setup program when the installation is complete.
        2. Back in the Converter app and make sure it has completed the final stage of processing using the “Old AutoCAD Program Reviver” tab – it should be green stating “SUCCESS”
    8. Now run your AutoCAD as normal

    Installing AutoCAD 2012 Service Packs

    We recommend that you download and install the latest Service Packs from Autodesk which can be found here

    Troubleshooting

    1. If your AutoCAD crashes while interacting with the Ribbon click here
    2. If you are unable to activate your product, or the activation process crashes:
      1. Try uninstalling the July 2014 Microsoft security update
      2. Try downgrading your Internet Explorer (IE) from version 11 to version 10 by following the instructions detailed here
    3. If you have crashing problems using the File->Open or File->Save dialogs inside of AutoCAD please read this blog entry on the File->Open or File->Save Crash in AutoCAD
    Copyright 2022 (c) Longbow Software