Although I don't know your project and can't tell why it crashes, there are many suggestions what to do in such a case on the following pages:

http://manual.conitec.net/debugging.htm

and

http://manual.conitec.net/bugs.htm

Once you've found out more about the problem, you can post here details about it - then other users can help you.

BTW, you don't need to uninstall the earlier A7 version before updating. Just installing the update in the Gamestudio folder will suffice.