Hey! When you import the pack and see only a grey color, that usually means the materials/textures are not hooked up yet. Which software are you importing into – Unity, Godot, Roblox Studio, or Blender? Each of them handles materials a bit differently, so I can give you a specific step-by-step fix once I know. Grey boxes are great for prototyping, but these assets are meant to be a bit prettier than that :)