In the vanilla game, Lich's do not have any hand to hand animations. When they get disarmed, they stand in place and accept death. The unofficial patch addresses this by allowing them to actually move around and cast spells. A set of broken hand to hand animations for the lich exist in the games files, I'm no animator, so I cannot re implement them. However, I made a compromise by giving the Lich the skeleton's hand-to-hand animations, it does stretch it's model in the animations sometimes to meet the skeleton's "skeleton," but this will have to do.
DOWNLOAD: https://drive.google.com/file/d/1mmF-DUrau4FWzG-517S5VqmRYFB6vh68/view?usp=sharing