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
NOTE: Autodesk stopped making 32bit AutoCAD since AutoCAD 2020
The best solution is to install 32bit AutoCAD on 64bit Windows, here are the affected versions along with their solution text…
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
Obtain your purchased copy of the Longbow Converter here
Start the Converter App
Insert your AutoCAD 2008 CD into your CDRom drive…
Select the 1st tab named “AutoCAD 32bit Installer Converter“
Using the “. . .” button, select your AutoCAD 2008 installation CD
Next, click the “Convert“ button and follow instructions
Once the conversion process is complete
click Install/Run Setup to start setup
Simply install as normal, remembering to…
Fully close the AutoCAD setup application once complete
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)
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:
Delete all files (*.*) from your C:\Windows\System32\config\TxR folder