Downloading the main game beta:
Right-click on the game name within Steam, and select “Properties”.
Select the “BETAS” tab.
Enter the password “publicbetaplease” into the text field, and click “Check Code”.
After the code is verified, select “publicbeta” from the pull-down menu.
Click “Close”.
Within a few minutes, the update will start to download.
Once the update completes, you will know if the update was a success if you start the game, and the version number under the main menu reads “1.0.3.124”.
Downloading the SDK beta:
Right-click on the SDK name within the Tools section of Steam, and select “Properties”.
Select the “BETAS” tab.
Enter the password “publicsdkbetaplease” into the text field, and click “Check Code”.
After the code is verified, select “publicsdkbeta” from the pull-down menu.
Click “Close”.
Within a few minutes, the update will start to download.
Once the update completes, you will know if the update was a success if you start the SDK, and see an option for “Dedicated Server” on the selection menu.
Removing the beta:
Right-click on the game name in Steam, or the SDK within the Tools section of Steam, and select “Properties”.
Select the “BETAS” tab.
Select “None” from the pull-down menu.
Click “Close”.
Within a few minutes, the build will revert to the public retail version.