To install simpy put "chr" folder with replacement to your game "USRDIR" folder.

I put separate animation file just in case so you can add it into your "c0000_a0x.anibnd.dcx" file manually using yabber:https://github.com/JKAnderson/Yabber/releases
To do it just unpack your archive and put "a00_6810.hkx" file from "SeparateFile" folder to "c0000_a0x-anibnd-dcx\Model\chr\c0000\hkx\a00" with replacement.
Then repack archive with yabber.