LW doesn't offer a lifetime membership. What site did you purchase it from?
Up until recently, if you purchased LW Pro it was good for 6 months free updates. Now you can buy "Extended Pro" which is good for 1 year of free updates. After that you have to purchase it again.
It sounds like you were scammed, and even if you weren't you still have to pay again to get Pro. You should have backed up a copy of it to a disc.
http://www.gnutellaforums.com/open-d...ial-sites.html Frequently Asked Questions - LimeWire
Remember the Basic version is free. Get it from the official site:
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