It utilizes the standard Visual Basic 6.0 event-driven language structure. Limitations:
Finding the official download is now the biggest hurdle. As of January 31, 2014, Autodesk is no longer authorized to distribute VBA 6 or earlier versions. This means the Official Autodesk VBA Download Page autocad 2013 vba module 64-bit
Migration strategies and patterns
Ensure you are installing the 64-bit module specifically for the 64-bit version of AutoCAD 2013. It utilizes the standard Visual Basic 6
Autodesk has long encouraged users to migrate from VBA to .NET (VB.NET or C#) or AutoLISP , as VBA is considered an aging technology with limited future development. This means the Official Autodesk VBA Download Page
For AutoCAD 2013, VBA is with this module. For newer AutoCAD versions (2015+), you would need a separate VBA module per release. Consider migrating to .NET (C#/VB.NET) or AutoLISP if you’re writing new automation.