You could install klik (http://klik.atekon.de). With that program, you can easily use new programs on Knoppix. The program is saved in 1 file, which you can store on your desktop or home directory.

First, install klik (see website for instructions), then go to the klik website and download Ktorrent, Bittornado-GUI or Bittorrent.

http://ktorrent.klik.atekon.de

http://bittorrent.klik.atekon.de

http://bittornado-gui.klik.atekon.de