So you've decided to take the path to the Dark Side? Then listen up!
If you are a Jedi and wish to go down the road to being a Sith, you will need 2 Ritz Bits, 5000qp and a Sith Holocron. The Sith Holocron is a patch that can be found from a Chaser quest, and only influences the Jedi class. Should you decide to continue down the path of the Light side of The Force, use the regular Ritz Patch that the rest of the classes need to reach their classevo.