If you purchased from PG Music, your online account has the info. This is not your Forum account; it is the account from which you can download the software.
WHEW!!! Thank you so much. Yes, I could get my serial number there. Never thought of that. Then the activation widow had me delete the contents of C:\Users\Public\Ticket where there were all sorts of serial numbers etc. from previous purchases and versions. Felt weird to delete all of that, but it did the trick.
Thanks Matt for the very fast response!!!