+1 to ktorrent. I used to use azureus till ktorrent was released. Now I use it exclusively.
Most of the stuff you need to install can be gotten from yast software manager. If you’re using kde, you’ll find yast and a direct link to the software installer under the kmenu > computer (not sure where it’s located in gnome but I’m sure it’s easy to find). When you have the software manager open, you can type in the name of the software and install it from there.