1. Stop using this garbo program utorrent. Ever since v3.x it became more about advertisement and apparently nosing around your USB stick when you connect it to your PC, rather than actual P2P file exchange. Either download v2.2.1 and disable updates for the program, or switch to qbittorrent or any other(preferably open source) alternative.
2. When you finish downloading ANY torrent, ALWAYS perform a re-check of said torrent task(google how to do it for your torrent client). There's always a possibility of losing a package and ending up with incomplete download, therefor non-working content.
3. I can assure you warmane's torrent(the wotlk one at least) is completely fine. It has seeds and is downloadable at virtually any time. Everything else(user location/ISP/speeds) is entirely not up to warmane.