This texturepack includes only the necessary files for the Tre's Tack Library mod to function. It will not function fully without it. Some features will work without it but not all of them.
The mod will say it is not for the 1.20.1 or 1.16.5 versions but it should function correctly. Please let me know if that is not the case. I don't have many resources to check it against for those versions.