Visual Basic Applications run very slow in AutoCAD 64bit

If you use VBA inside of 32bit AutoCAD you will have noticed that it is around 1000x times slower when running the same VBA code inside of 64bit AutoCAD.

This is because AutoCAD 64bit ships with the 32bit VBA DLL in a separate out-of-process executable rather than loading the VBA DLL inside of AutoCAD itself. Therefore, a lot of marshaling is incurred communicating between the out-of-process VBA executable and 64bit AutoCAD.

Other issues you may be seeing: Run-time error ‘429’: ActiveX component can’t create object

Affected, all 64bit versions of (and variants of)

  • AutoCAD 2008 | AutoCAD 2009 | AutoCAD 2010
  • AutoCAD 2011 | AutoCAD 2012 | AutoCAD 2013
  • AutoCAD 2014 | AutoCAD 2015
  • AutoCAD 2016 | AutoCAD 2017
  • AutoCAD 2018
  • AutoCAD 2019
  • NOTE: Autodesk stopped making 32bit AutoCAD since AutoCAD 2020

The solution to slow running AutoCAD VBA

The best solution is to install 32bit AutoCAD on 64bit Windows, here are the affected versions along with their solution text…

AutoCAD VBA Enabler downloads

AutoCAD VBA enabler modules can be downloaded using the links below…

AutoCAD 2010 VBA 32bit 64bit | AutoCAD 2011 VBA 32bit 64bit | AutoCAD 2012 VBA 32bit 64bit | AutoCAD 2013 VBA 32bit 64bit | AutoCAD 2014 VBA 32bit 64bit | AutoCAD 2015 VBA 32bit 64bit | AutoCAD 2016 VBA 32bit 64bit | AutoCAD 2017 VBA 32bit 64bit | and newer

Copyright 2023 (c) Longbow Software

Installing 32bit AutoCAD 2008 on Windows 7, Windows 8 and Windows 10

These instructions solve issues around installing/running your old AutoCAD 2008 on newer versions of 64bit Windows 7, Windows 8 and Windows 10.

Some more common issues stopping you from using your AutoAD are error messages like these…

“This operating system is not supported by AutoCAD 2008”


“FATAL ERROR: Unhandled 0x… Exception…”

You can solve all the problems with your AutoCAD 2008 automatically by using our Longbow Converter App, it fixes and manages the AutoCAD 2008 installation so that you can be up and running again.

NOTE: Autodesk no longer supply License Activation codes. Once you have installed your AutoCAD (following the instructions below) you will need to authorize/activate your AutoCAD yourself, find out how by clicking here

How to install AutoCAD 2008

  1. Obtain your purchased copy of the Longbow Converter here
  2. Start the Converter App
  3. Insert your AutoCAD 2008 CD into your CDRom drive…
    1. Select the 1st tab named “AutoCAD 32bit Installer Converter
    2. Using the “. . .” button, select your AutoCAD 2008 installation CD
    3. Next, click the “Convert button and follow instructions
  4. Once the conversion process is complete
    1. click Install/Run Setup to start setup
    2. Simply install as normal, remembering to…
      1. Fully close the AutoCAD setup application once complete
      2. Do not reboot, if prompted
      3. Close the Converter App.

Installing the AutoCAD 2008 Service Packs

Installing AutoCAD 2008 sp1

  1. Download the Download the AutoCAD 2008 sp1 zip from here (autocad2008lockedsp1.exe)
  2. Unzip the zip file and simply run the autocad2008lockedsp1.exe – 32-bit as normal


– 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 2019 (c) Longbow Software

Solving the AutoCAD Failed Installation, Aborted 1603 error

What is the 1603 Install Error

The 1603 MSI installer error is a generic error code “A fatal error occurred during installation” on Windows 7, Windows 8 or Windows 10. Basically,  it’s not specific; anything could have gone wrong.

Microsoft document this error and lots of possible ways to solve it here…

You receive an “error 1603: A fatal error occurred during installation” error message when you try to install a Windows Installer package

Fix AutoCAD specific 1603 Errors

Aside from the Microsoft documented 1603 errors above, AutoCAD itself has numerous issues with their installer mechanism which when failures occur can also generate the generic 1603 MSI error code.

AutoCAD 2020 Licensing Error 1603

It seems that AutoCAD 2020 has some issues installing mainly due to their Licensing system component.

Installation incomplete. Some products failed to install.

AutoCAD 2020 did not install (error code: 1603)

Autodesk documents how to fix it here

All other AutoCAD 1603 Errors

There is an App built which specifically scans AutoCAD’s setup so that either the 1603 error is gone (fixed) or it does not affect the install… Check  out the blogs on how to fix your AutoCAD’s 1603 error (if your version is not listed below use the search box at the top right of this page)

32bit versions of 
AutoCAD 2012   AutoCAD 2013   AutoCAD 2014   AutoCAD 2015
64bit versions of 
AutoCAD 2012   AutoCAD 2013   AutoCAD 2014   AutoCAD 2015
If you still have problems, why not contact Longbow Software Support
Copyright 2019 (c) Longbow Software

Error code 1935 when installing AutoCAD 2008

If you are getting Error 1935. An error occurred during the installation of assembly ‘Microsoft.VC80.OpenMP.type=”win32″.version=”8.0.50727.42″ when installing your AutoCAD 2008, try these steps to resolve it:

  1. Delete all files (*.*) from your C:\Windows\System32\config\TxR folder
  2. Next start a cmd.exe prompt in administrator mode, then type at the command line:

    fsutil resource setautoreset true C:\

  3. Now Reboot
  4. Next install all Windows updates, rebooting until there are no more Windows Updates left to install
  5. Now try to install your AutoCAD 2008 again