If you bought Pro in 2005 then your Pro benefits would have expired years ago.

The official LW site has never offered a 'lifetime membership'. Only scam sites offer those.
Frequently Asked Questions - LimeWire

http://www.gnutellaforums.com/open-d...ial-sites.html

In 2005, the official site offered LW Pro for $18.88 which included 6 months worth of tech support & free updates. Click on the link below to see the Pro options available now.
Features - Lime Wire
And also a one-off Pro deal with no tech support or updates: Download LimeWire 5.2.13 - Lime Wire