The Bonus Contents DLC contain :

• The Golden Armor skin for the character Lonely Knight!
  
• Press B on Lonely Knight when selecting your Character!
  
• In-Game items : 5 x Dimensional Heals, 5 x Escape Idols & 1 x Rebirth Idol
  
• The original game trailer featured on Steam...
  
• 6 Pieces of artwork in both PNG & PDF format that include :
  
• 2 Wallpapers, the game covers, the game logo and the game icon...

To find the bonus content, locate the Steam Apps folder, open it and locate the Common folder, open it. Locate the game folder and all this content will be within the Bonus Content folder...

*If you have any problem installing this DLC uninstall the game and reinstall it at the same time as the DLC, it should fix it.*