The upgrade process only requires your A6 user ID and password. If you still have that, you should have no problem. If you also have lost your user data, please contact the support. They have a list of advices what to do in such a case.

- Our sales people will probably kill me for saying that, but if you're short on money you can also upgrade to a sort of A7 Extra without paying anything. Just download the free lite-C version. It contains an earlier version of the A7 Extra engine.