First, confirm the Minecraft version compatibility. Let's say OptiCraft 1.17.32 is for Minecraft 1.17.1. Next, check if it's a mod or a texture pack. If it's a mod, the user will need to install Forge or Fabric. The guide should include downloading the correct version of Forge for 1.17.1, then installing the mod. If it's a texture pack, they need to download it and add it through the in-game options.