Did you buy Pro for $18.88, from www.limewire.com?
You should've recieved an email from limewire, with a link to your Pro personal download page... try downloading again from there

Providing you did buy from the official site, there are links below to help. You might have to send a PM to RSterne & see of she can sort things out (remember, it's the weekend so you won't get a reply today!).
http://www.gnutellaforums.com/showth...threadid=54008