Challenge ProMode Arena Mod files needed to launch CPMA: CPMA 1.52
Official maps (required if not updating from 1.48): CPMA Map pack
Official engine: CNQ3 1.52
If you're not installing Quake 3 via Steam, you might need to install the 1.32 Quake 3 Point Release: If you want to use the vanilla Quake 3 engine (and not CNQ3), you need to install 1.32c: Please refer to the installation guide if you have any problems.
Source codeIf you're interested in the source code for the CNQ3 client, then feel free to check out the official repository on bitbucket.