@Viivid For you, and anyone who wants to know:
This avatar requires Final IK-Stub, VRCFury, Jerry's Facetracking Templates, Cancerspace 3.5, Some form of Poiyomi toon/Poiyomi pro at absolute minimum.
https://forum.ripper.store/topic/17276/poiyomi-shaders-dump-35-gb/105 - Easy access to Poiyomi shaders of any kind (pro is the goat!)
https://github.com/VRLabs/Final-IK-Stub - Required to fix missing scripts
https://vrcfury.com/download - Required tool
https://github.com/Adjerry91/VRCFaceTracking-Templates - Required for Facetracking version (check releases for UnityPackage)
https://github.com/AkaiMage/VRC-Cancerspace/releases/tag/v3.5 - Required Shader
Optional Things to download!
https://jeteesvr.gumroad.com/l/memoryoptimizer - The memory optimizer used by the creator (may help to import this if you want to make sure 100% everything is up to date!)
https://github.com/VRLabs/World-Constraint - It is unknown if this is needed, but just in case, here it is.
AudioLink should automatically be in your packages to choose from, and is something to consider, but again not required as far as I know.
I highly recommend going with Poiyomi toon 9.1 or higher, or Poiyomi pro 9.1 and higher, as more and more avatar creators have begun to abandon the 8's
You're welcome!