Torrent includes pak0.pk3, an archive of files essential to Q3a. This file is required to run Q3a, it can be used with the ioquake3 engine, an open-source enhancement of the idtech3 engine.
The ioq3 client may be downloaded at www.ioquake3.org.
To use this file, one must place pak0.pk3 into ./baseq3.
(This file may be used on Windows, OS X, Linux, and other Unices)