try typing this into the console if you know the name of the bit torrent executable:
whereis bittorrent (assuming this is the name of the executable)
this will display the path of your bit torrent program. I'm about 90% sure this will work. The whereis command has helped me when I really needed to know where those pesky programs were lurking. On a side note, you can use the whatis command in the same way as whereis to find out what a program is (like, whatis bash). Hopes this helps.