You very definitely made a mistake buying anything called Lifetime membership for any software. It does not exist. LW do not offer lifetime membership, only scam sites offer anything of the type. Chances are you do not even have LW pro but LW basic.

Check your browser history to see who you paid. Or your account details. Known Scam Sites (click on link)

Might not be the same scam company because many out there, but see if advice here helps: get your $$$ BACK!!! (music members)

In meantime, get LW Basic, it's FREE & really only minor differences compared to LW Pro; Download LimeWire 5.1.3 - Lime Wire