I think you're missing the point. I suspect you've gone to a scam site who you paid & then downlded the free version from LW most likely. If LW did not recognise your email address then you obviously didn't buy it from limewire.org

At the LW downld site, you have 2 specific choices to downld either pro or basic. So to say you didn't have a choice but to get pro doesn't sound right! It means you didn't actually get the real pro from the "official" LW site. Cancel the transaction thru your credit company. Tell them you were scammed. The official LW downld page is below:

http://www.limewire.com/english/content/download.shtml