Like Ketan Bhola, (above), I’m having the exact same problem:
I registered the software as advised in the mail (on the day it was offered by SoS).
However, after every few scans, the software would repeatedly ask me to “activate”, which I kept doing.
Now I get the error “You have entered an invalid serial number”
Please help! (I thought that software registration algorithms were better than this!)
Thanks.