In short, this mod page includes;Over a hundred new skins, almost all with bots of varying characteristics. Proper Weapon HD Retexture, Crosshair "improvements". Over 20 new maps of varying(amateurish) quality and theme. And some optional game-altering modifications(with each having different themes/"flavors" to choose from).
The pak file that contains this specific mod is "pakcz01T.pk3". If you guys just want this particular modification applied to vanilla quake 3, simply place pakcz01T.pk3 inside your baseq3 folder.