I did the same thing. I operate on OS X Tiger and purchased LW Pro and realized later that it required Leopard 10.5... then Java 1.6... then it would work. Is LW and Mac in on this together? haha. So, I tried downloading the "classic" version. It wouldn't even open. So, I got LW 4.12 from a friend and it will load but will not connect. I had LW before and never had a problem, this sux. What can I do? Is there another file share program for Mac OS X other than LW? I'm very frustrated. Please "Lord of the Lime Wire" help a kitty out.