Have been trying to use it on my Mac Pro since they first came out and I got mine in the mail. Musicast gives me an irrelevant address to link to my hosted Muaicast site, one that I can't even visit myself as it's not a proper link. I purchased this app after using it on my G5 and it worked very well. Have tried to contact the company that produces the application more than once without reply, so I cannot recommend purchasing.