Sorry but there is no lifetime membership. You've been scammed. LW is free unless you get pro for US $18.88 with 6 mths of free updates. See Membership? - Download p2p Clients ONLY Thru Official Sites (click on link)

If I were you I'd contact my C/C company & speak to the scam dept & tell them about the situation. You can downld LW from here http://www.limewire.com/english/content/download.shtml