Download the source code, 100% legally at http://linux.softpedia.com/get/GAMES-ENTERTAINMENT/FPS/Quake-III-Arena-Source-4534.shtml
When you open the version you would like to use, it will ask for your game directory. This can be found at /Users/<your user here>/Library/Application Support/CrossOver Games/Bottles/winxp/drive_c/Program Files/Steam/steamapps/common/quake 3 arena
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