Welcome to ioquake3.

You can find us on the web at:
http://www.ioquake3.org/
This is the 1.36 release for Mac OS X.
If you run into any issues, please check out our website's discussion page for a place to talk about them and get help.
http://ioquake3.org/discussion/

To install, simply copy the ioquake3 folder to your applications directory, then copy the pak0.pk3 file
from your legal Quake 3 Arena CDROM into the baseq3 sub-folder.
You can also copy it over from a boot camp'd steam install or whatever. 
Just make sure to get your cd key as well.

If you don't have Quake 3, check out some of the excellent games made with ioquake3:
http://ioquake3.org/extras/derivative-games/

On ioquake3.org you can also find links to the latest source for this release, packages for other platforms, and more.
I hope to see you on server.ioquake3.org soon!
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Thanks,
Zachary Slater
zachary@ioquake.org