got it off the website https://www.fortressone.org/ its THE BEST!
A downloadable game for Windows and Linux
FortressOne is a free, open source fork of the original 1996 QuakeWorld mod Team Fortress. It is a fast-paced, class based, arena first person shooter remastered with refined graphics, new mechanics and evolved gameplay.
FortressOne is a stand-alone game. Download the zip file, extract and run.