Switch the Branch on Your Garry's Mod Server
Switching branches lets you run a beta or legacy version of the Garry's Mod dedicated server. If you need to reset server files after switching, see Reinstall Server.
Steps
1. Log in to the Game Control Panel.
2. Locate and click the Switch Branch icon on the left-hand side of your game panel.
3. Choose the branch you want to run from the dropdown, then click Run.
Note: If the branch does not change after completing the steps above, open the File Manager, locate and delete the
steamappsfolder, then repeat the steps above.