Access the build by going to the Properties>Betas tab and selecting the Testing branch from the dropdown menu. This will work on both the regular and demo versions of the game.

Some highlights:

• Total overhaul of the inventory system
  
• Total overhaul of status effects
  
• Total overhaul of the hub shop
  
• Fixed Jobs
  
• Exploration fixes (numerous)
  
• Combat fixes (numerous)
  
• New cards & card art
  
• New abilities
  
• Extra tooltips & tutorial info
  

If you run into any issues, let us know on the discussion board!