Extract the "Gravestone Dungeons vx.x" zip and drag the "Gravestone Dungeons vx.x" folder into the data pack folder of the world you are playing. Drag the "Gravestone Dungeons vx.x Resource Pack" into your resource pack folder and enable it. It MUST be in at least the second position under your main non-data pack-related texture pack.

This data pack depends on the activated resource pack.