The 2.0 -> 3.0 thing may be browser related. I remember Firefox renaming an already existing file like that.

I think there'll be a real user-area on nero.com (soon?). If you read carefully while registering you read something like "..with entering your personal password you agree to become part of the personal nero user area.." (freely translated from the German registering-page). I suppose this will be the place for future downloads etc.

Marcus