Did you buy Pro from the official site?: Lime Wire » Download LimeWire

If you did, your Pro's way out of date. Your email address is only in the database while your Pro benefits are current.
Back then, buying Pro entitled you to 6 months worth of support & updates. So your Pro benefits would have expired around Dec 2006/Jan 2007. And after that you can't download any more Pro installers for free. People need to save the Pro installers that they download...then they can be used for as long as you like.

If you bought some 'lifetime membership' from a scam site...LW's official site has never offered that. It's just a scam.
Membership? - **BEWARE** - Download p2p Clients ONLY Thru Official Sites (click on link)