I wouldn't trust that site at all! Honestly, it might sound like a good deal to get Pro for free but what's it worth if the app doesn't work anyway? I bet you'll be getting popups for a week from that place

If you want to try LW it's best to get the free version first & try it out. Then if you're really happy with it, think about Pro.

Try installing the basic (from the official site!) this way:

Download Java's JRE offline installer here
http://java.sun.com/javase/downloads/index.jsp
Go to add/remove programs & remove your previous Java version before installing the new one. Make sure that you install Java before installing LW.

Now download LW using it's offline installer here
http://www.limewire.com/english/content/download.shtml