The two in the name is not a version. It's because the game is based on the quake 2 engine, i think.
Jitspoe was trying to make a game that uses the Quake 3 engine. Sort of like a Paintball 3. He stopped working on it because of all the problems in mapping the game.
The errors were probably not just for the mapping part of the game, but some other parts too (I think). I remember him saying that the bots have really bad accuracy or they would shoot all over the place or something like that.
I guess a way to improve the graphics is by making the textures pictures of real stuff. I'm not sure if they are or not.
I guess another problem is getting more textures. Most of the time, if I want HD textures, I have to download them manually. Some maps came with them when I played them for the 1st time on a server. One of the maps that came with the was Urban Night.
Some times, I get an error message in the console saying that the server couldn't find the file or refused download or something like that. Making me have to download them manually.
I guess the game could come with all the textures that are currently available for the game (including HD textures). The textures should also be automatically updated.