The only change I remember was from build 3 -> 4 included a registry entry to support MorpheusX. The changes were listed on Zeropaid.com when they were released, but dangit, Zeropaid doesn't have a search engine anymore to find the news articles with the changes

They were all very minor though.
BTW DreDay, that page is loaded with stuff that the mods might not like, I suggest editing that to
the real Kazaa Lite site.
edit- for some reason, DreDay's link to kazaalite.com, when clicked on, sends you to a third party (unappropriate) site, but if you enter in Kazaalite.com manually, it brings up the same site as kazaalite.tk. So DreDay, I think you should merely remove the {L] tag that makes it a link and just put in 'www.kazaalite.com'.