Actually, the GUI lacks the ability to change .torrent files location. You can two choices: 1. GUI: add this torrent again, if needed, do the "Change download location", and then force -recheck. It can take time, but eventually, you are done. 2. Close utorrent, and backup,search/edit resume.dat (using the BEncode editor), and change the .torrent path(es) in there   Good luck!