Getting the game:
Step 1: Download Quake3's pak0.pk3:
Mirrors:
http://www.cis.ksu.edu/~ctb/depot/pak0.pk3
http://ccst.jlu.edu.cn/pub/game/quake3/Pak0.pk3
Put it in c:\quake3\baseq3\
Step 2: Download Quake3 1.32 Patch: http://games.mirrors.tds.net/pub/planetquake3/q3pointrelease_132.exe
Install it to c:\quake3\
Getting the mod:
Step 3: Download CPMA 1.35: http://www.challenge-tv.com/index.php?mode=filedetail&file=106&dl=106
Extract to c:\quake3, giving you a c:\quake3\cpma folder.
Step 4: Download CPMA Map Pack: http://www.promode.org/files/cpma-mappack-full.zip
Extract to c:\quake3