It is here http://www.idsoftware.com/games/quake/quake2/index.php?game_section=updates but now it's compiled q2 3.20 version, original deathmatch maps and ctf in 1 file. I think it's nothing dangerous, but if you use different textures on some maps it can overwrite or mess up something. Or you can try here http://www.savageleagues.com/q2ctf/ here on right it's old skool pak. maybe it works.