Where did you buy Pro from & how much did you pay for it? LW basic is free & Pro costs $18.88 USD for 6 months of updates & email support.
The only official site for downloading either version is www.limewire.com

When you buy Pro from the official site, you'll recieve an email with a link to your Pro personal download page & you can download from there.
If you bought from a scam site, please contact your bank/CC company & report this...ask them to cancel the transaction.

Have a read through the 2 threads below for more info. Page 5 of the first thread has a list of known scam sites.

Membership? - **BEWARE** - Download p2p Clients ONLY Thru Official Sites (click on link)

Get your $$$ back!! (Music Members)