Where did you buy LW? Sounds like you were scammed...there's no lifetime subscription. LW Pro costs $18.88 USD & covers you for 6 months of free updates & email support. LW basic is free. Since you bought so long ago, there's no way you'll get a refund from the scammers now

The only official site for download of either version is www.limewire.com
See the thread below for more info (page 5 has a list of scam sites)
http://www.gnutellaforums.com/showthread.php?t=28751