You were scammed

Official limewire site is www.limewire.com and it clearly states that you get only 6 months of free updates

You may find this this thread interesting

http://www.gnutellaforums.com/open-discussion-topics/28751-membership-warning-beware-download-p2p-clients-only-thru-official-sites.html

And this one (allthough it's probably far to late for you if you bought it that long ago)

http://www.gnutellaforums.com/open-discussion-topics/44499-get-your-back-music-members.html