Modern Windows security features (UAC) may block the VBA engine from initializing.

: Specifically designed to work with the 64-bit architecture of AutoCAD 2010, enabling legacy 32-bit VBA code to operate within the 64-bit environment (though some code adjustments may be necessary for API calls).

Beginning with the 2010 release, Autodesk moved toward .NET and AutoLISP as the primary engines for customization. While they didn't remove VBA support entirely, they stopped "shippng" it inside the main installer to reduce the software's footprint and encourage modern coding practices.

The is a free, standalone module released by Autodesk that re-integrates the VBA IDE (Integrated Development Environment) and runtime engine into 64-bit versions of AutoCAD 2010.