I switched to PRO and now LW doesn't work.
 

I have had LW on my computer for over a year and it has always worked fine. Yesterday I finally upgraded to PRO and since then I can't download anything, it will find the song and just say connecting and then go to needs more sources. Am I doing something wrong?

The connecting/need more sources thing usually shows up when you're trying to download fake files. See the stickies below for some more info

Fake files showing up in search results
How to find music

If you're seeing this with every file, even old files with low numbers of sources, try deleting LW's preferences folder when LW's closed. See points 2 & 3 below
Fixes for LimeWire