Did you buy Pro from www.limewire.com less than 6 months ago (remember, your Pro payment covers you for 6 months of updates)? If so then there are links here to help
http://www.gnutellaforums.com/showth...threadid=54008

If your 6 months is up or you bought from another site, you'll have to either pay for Pro again or just download the basic (free) version