Diablo 1 HD Hellfire Mod | Awake

I am very confused with this so I wanted to make my own thread asking this. I currently have Diablo 1 running with it's mod smoothly. What do I do to add the Hellfire expansion to my Diablo 1 game to make it work with the game? The hellfire forum seemed dead so posted it here.

Here is section for "Awakening" mod, not "Hellfire".