If you bought Pro, you can follow the link to your personal download page. If you haven't saved that link, go here & enter the email address that you used to buy Pro.
http://sales.limewire.com/support/pro_lookup.php

Before you install Pro, I'd reinstall Java & use this version (1.4 is very old). Use the JRE offline installer & remove your current Java verison before you install this one
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11

Once you've installed the Java, then reinstall LW

I'm a bit confused as to why you'd reinstall that old Java. Did you buy Pro from Lime Wire » Official Website & Free Download « for $18.88? Your Pro payment entitles you to up to 6 months of free updates & email support.