If you download this from a browser, put it into your world's datapack folder. If you install this from curseforge, install the mod "Global Packs" to have the datapack working. If the mod "Global Packs" isn't available for a specific version, move this datapack from your resourcepacks folder into your world's datapack folder.
You can only craft Netherite Upgrade Template with 9 netherrack, put it into the crafting table to cycle through all templates