If your installed AutoCAD is hanging on startup then read this post first Your 64bit AutoCAD 2010 was never designed to run in Windows 10, Windows 8 or Windows 8.1 64bit (these versions of Windows are newer than AutoCAD 2010) – you may see random crashing, hanging on startup and/or slow performance NOTE: If you are running VBA macros in AutoCAD and they are running extremely slowly, you can gain up to 1000x better performance by NOTE: These steps do not bypass normal Autodesk licensing/authorization, you should expect to use your own serial numbers in the normal way. • Obtain your copy of the Longbow Converter • Start the Converter tool • Pick the 1st tab named “ AutoCAD 32bit Installer Converter“ • Using your mouse, right click the tab text “ AutoCAD 32bit Installer Converter” so that it changes to “ AutoCAD 64bit Installer Converter“ • Next, using the “” button, select your AutoCAD installation CD and follow the instructions presented by the Converter tool user interface. • Once you have completed the AutoCAD installation process • close the setup program then start the Converter software • Select the 3rd tab “ Old AutoCAD Program Reviver” • Using the “” button, pick the newly installed C: Program Files Autodesk AutoCAD 2010 folder • then click “ Fix Old Program“ • Now you can happily run your AutoCAD 2010 64bit on Windows 8 and Windows 10. Optical Flow Fcpx.