Here's a couple of simple mods to bring the cat mount into the game. These replace the Spectral Tiger mount. The Swift Spectral Tiger is unaffected!
Keep in mind you can only use one or the other, since they affect the same model.
To install: expand the zip directly into your epsilon patches folder at Epsilon8300\_retail_\Patches
This one uses the original texture: https://drive.google.com/file/d/1SEzUZWTjueLr6UAeIjODdo-_mXuvHqed/view?usp=share_link
This one uses a blue texture: https://drive.google.com/file/d/1GXBdFRtT7g7Lp2Sfm91ZRNirN7v6kwd-/view?usp=share_link