In the recent Charity bundle we supplied the key 'Sifu Deluxe Edition Upgrade Bundle'
Please note that this key will upgrade a previously purchased 'Sifu' to the Deluxe edition. It was supplied in the Charity bundle as a bonus game.
If you don't have the game 'Sifu' then you can purchase it from https://www.fanatical.com/en/game/sifu-epic, You can then upgrade to the Deluxe edition using the key from your Charity bundle.