Check your Downloads area for correct serial number
Greetings -
This happened to me this morning, also.
I recopied my serial number from the Product Downloads area and used that one, which worked fine.
I believe I had been most recently using the serial number provided through my Extension Library Subscription, now defunct.
I'm sure some the my other Super Suite extensions will require a change-up of active serial number for this reason, also.
Best Regards,
-Jeff-