Meant for Black Ops 3 .xanims only.The zip contains two versions, one for Blender 2.79 as that serves a way to import .xanims using this addon that only works in 2.79.Once you import the xanim, simply save with that one animation imported. Then use the 2.9 version, since it has the materials/modifiers setup, to append the saved animations (make sure to before save the 2.79 .blend with 2.9 to convert it to have collections), then append the collection, use the action editor to add the animation (you’ll also have to push the RAM-7 animation in the NLA editor first).