Looks like the installer didn't create the menu shortcut for you
Trivial enough to create your own though
In a terminal:
sudo gedit /usr/share/applications/bittornado.desktop
Cut and paste the following into gedit - include your own full path and icon where indicated
! At a guess I would think the path would be /usr/local...
Comment=Bit Tordado is a GUI bittorrent client written in python.
Exec=<YOUR FULL PATH TO btdownloadgui.py>
Icon=<YOUR FULL PATH TO BIT TORNADO ICON>
Save the file and you should find it appears in your menus (bottom line of .desktop indicates menu categories - you can edit them to suit)
** If you do not need to enter the full path to btdownloadgui.py in a terminal yu can leave the full path out of the .desktop file although it is usually best to be explicit as to which btdownloadgui.py file you want as there is the potential for there to be multiple versions on your machine at any one time