There's no dramatic differences with pro. You connect to 5 peers instead of 3 with the free version thus giving LW better quality connection & for most people better results.
 
I think perhaps you should see these hints: A well set-up LW can start to automatically continue its dwnlding after it's settled down perhaps 2 out of 3 times you open LW. 
Optimising LW & Maximising Uplds & Dwnlds A  (1st post only) & also 
Part B which is even better  & last & least are 
search & dwnld  hints.  The latter one I've been thinking about re-writing for some time. That's just for playing it safe. eg- I show all speeds & qualities. 
eg: 
http://www.gnutellaforums.com/showth...028#post116028 
Also make sure you're using the most recent Java: Update your Java 
version 1.4.x OR 
version 1.5 (take the JRE)