Instructions

 
  1. In Steam, add the game to your library by clicking the Games menu (top bar) and choosing Activate a Product on Steam

  2. Paste in your Steam key to add the game

  3. Play the game!

 

If you have the ALPHA installed:

  1. In your library, right click on the game and choose Properties
  2. Go to the BETAS tab
  3. If your drop-down says Alpha, switch it to NONE - Opt Out
  4. The Beta should download and replace the old alpha build!