@vidavel I own a CD of Quake 3 for Mac but I was able to install and run the game without any of that. The best (and easiest) installer I’ve used so far is this one. Just download the installer as a zip, unzip it, navigate to the unzipped folder in Terminal, run the Terminal command included in the readme file and you’re done. Works perfectly right “out of the box” on my MacBook Air.