I'm having the same problem-- I've just upgraded to OS X (10.1.2)-- I have been using Limewire happily for a year or so but just tried to download the newer version for OS X-- after a few aborted tries (where it only partially downloaded a couple of times, but since I'm on dial-up even that took ages) I downloaded the whole thing, but when I double-click I get an error message saying it "cannot be mounted." This is the second time I tried to download it-- the first time it seemed to think it was a Quicktime file. Doesn't anybody have it archived as just a StuffIt file? Thanks for any advice.