Replying to Mac Torrent Questions

Ok so first of all, I just recently got a mac and downloaded BitTorrent on it. I got some torrents off google or whatever (just searched what i wanted and then downloaded them) and got them into BitTorrent. For some strange reason, FCE and photoshop, which were at around 40% in BitTorrent, did something wierd and said they couldn't be completed or whatever. Can somebody tell me what's wrong? Or give me another method of doing torrents. Thanks