Sorry to say, but you were scammed. The official LW site (where you download new versions of LW Pro) Lime Wire » Official Website & Free Download, BitTorrent « has only recently started offering a 1 year deal for Pro.
A year ago, Pro bought from the official site would've entitled you to 6 months worth of free updates & support.

If you didn't buy from the official site then your email address wouldn't ever have been in the official database & so it won't be recognised.

If you can remember which site you paid for Pro & have an address, contact them & see whether they're willing to help.
Membership? - **BEWARE** - Download p2p Clients ONLY Thru Official Sites (click on link)