Portable versions often trigger "DLL not found" errors (like acdb16.dll or msvcr71.dll ) because they can't find the necessary shared libraries on your current system. :
Older versions of AutoCAD often struggle with modern hardware acceleration and font directories. error autocad 2005 - Autodesk Community autocad 2005 portable fix
Before you risk your computer's security and legal standing, consider these modern solutions that solve the same problem without the headache. Portable versions often trigger "DLL not found" errors