There's no username required to download Pro from the official site...where did you buy LW & how much did you pay?

The only official LW site is Lime Wire » Official Website & Free Download, BitTorrent «
Pro costs $24.95 for 6 months worth of updates & email support or $34.95 for a year's worth.

If you do have an official Pro, just download again from your personal download page. Or go here & enter the email address that you used to buy Pro
http://sales.limewire.com/support/pro_lookup.php

If you bought from a scam site, contact your bank/CC company straight away & report this.
Membership? - **BEWARE** - Download p2p Clients ONLY Thru Official Sites (click on link)

get your $$$ BACK!!! (music members)