The full install. If you are a new player, or installed before August 4th, 2009, you need this.

The Lite Patcher is for patching and fixing your current install.
It will not work properly unless you have previously installed the Large install in the first link.
It is unneccesary to download unless or you are told to do so by the staff.

Optional BGM's, Skins, and whatnot.