I get the same activation problem as Arndtvk, ryme, and psaldari (“The email address provided does not match with the serial key provided at the time of purchase. Please try again”).
Although I did change my email address on the upgrade form, I’ve tried both email addresses with no success. Have tried using Firefox as well as Safari, just incase it was a browser-related problem.
The only thing I can think of doing is waiting for several (5?) hours, then trying again: hoping the activation server gets access to more current information in that time.
If anyone has any other ideas, I’m open to suggestions, except for the suspiciously dangerous ones.