Ther is no such thing like a "lifetime membership" for LW.
LW basic is free and the pro version costs $ 18.88 with free update and tech support in the first 6 month.
Sorry pal, you got scammed, read here:

http://www.gnutellaforums.com/showthread.php?t=28751

Only buy and download LW from the official site:
http://www.limewire.com/

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"