Which version are you using now?

What OS are you using?

If you're still using LW 4 then you'll find LW 5 way different (& not necessarily better). Use the forum search to look for update or problems update or something similar - you'll probably find a heap of threads

Also check out the LW changelog to see what's been changed in newer versions: Changelog - LimeWire

Just remember that if you're using an older Pro version & haven't renewed Pro - if you update then it will be to the latest basic version. And if your Pro installer isn't saved then you'd lose the Pro version completely