Gary Grigby's War in the East Public Beta

Right click on the game and select "Properties". Select the “Betas” tab. The Beta tag "Beta - Public Beta" will appear in the Beta dropdown list. Select it and close the Properties window. Steam should now update the game to the beta version. If the update does not start automatically, launch the game to force the update process or 'verify integrity of game files' from the 'Local Files' tab.