This behavior has to do with the Python version, especially for Vectorworks versions 2020 and older.

After calling an ElementsCAD function, e.g. object "cabinet", Vectorworks crashes - ElementsWiki
After calling an ElementsCAD function, e.g. object "cabinet", Vectorworks crashes - ElementsWiki

Figure. Above: Hold down the Ctrl key to intercept the “ElementsCAD Info” dialog and display an ElementsCAD license check (from ElementsCAD rev. 1823):

After calling an ElementsCAD function, e.g. object "cabinet", Vectorworks crashes - ElementsWiki

The 3rd option “License Check…” fixes problems regarding Python, licensing, etc.