click to download a file, and a pop up appears
 

when i click to download a file, a pop up appears that says Limewire is unable to find a license for this file, download anyways?, should i click yes? what do i do?

It's up to you. If you click to d/load it anyways, you may end up d/loading copyrighted files, but if you click no you won't find much you'll be able to d/load.

See: License Warning Option.

so it wouldn't be bad if i click yes than right ? its just wierd cause it never showed up before when i used lime wire

You'll want to click "Yes" or your not gonna be able to d/load anything. So yes click "Yes" ;). If you don't want to see the popup again, put a tick by "Always use this answer" then click "Yes".