1. Steam update your server to get the latest files.
  2. Go to the Commandline manager.
  3. Click Edit on an existing Commandline, or create a new one (enter a description of the commandline).
  4. Change the Map Name to: Aberration_P
  5. Check the box to the left of the map name box.
  6. Save the commandline.
  7. Make sure the commandline is selected (Click Select on the right) it will appear Green and Bold if selected.
  8. Restart your server, and enjoy the new DLC!