Basic LW is free.

The only official site for downloading Pro is Lime Wire » Official Website & Free Download, BitTorrent « (payment to Limewire LLC shows on your CC statement).
Check the download page for current Pro prices: Lime Wire » Download LimeWire

A couple of years ago, Pro cost $18.88 & entitled you to free updates & email support for 6 months. So it sounds like you were scammed if you paid $19.95 back then

Sorry, but even if you did buy Pro from the official site then your benefits would be way out of date by now & you'd need to buy Pro again to be able to download a new Pro installer.