It just is included with Chankast. You have two .exe files and the one called chankast.exe is the new gfx version. The other .exe file called chankast_old_gfx.exe is the old gfx version.
The difference between them? Most games are faster on the old gfx version, but the new gfx version has better graphics. Try games with both versions to see which version works the best for a game.