Each TDM mission comes packaged in a so-called PK4 file (just a .zip file with a different extension).
To install a new mission, just download that file and place it into your darkmod\fms folder. The mission will be available next time you start the game. Refer to our wiki to get further information on Installing and Running Fan Missions.
New players: be sure to read through the Gameplay section on our wiki!
