Please note it's 2.0a and not just 2.0. If that's what you've got, then is it still the same error popup ("the exe has stopped working"), or is it something else? When does it occur? It could be that you simply have a corrupt .dat file which makes the game crash when spawned as a weapon or something.
A-Engine: A new beat em up game engine inspired by LF2. Coming soon
A-Engine Dev Blog - Update #8: Timeout