A) EFB copies doesn't need to be set to RAM for Xenoblade AFAIK.
B) Try all the values of texture cache accuracy. Although I'm told it shouldn't, it can affect the names Dolphin assigns textures, so if it isn't set to the same value as it was for the guy who created the texture pack, Dolphin will look for textures with different names to the ones they have. If you find the value they used, then it should start working.
c) There's a chance the names have been screwed up in some other way, which would mean you'd have to rename them all. To do that, you'd need to turn on Dump textures, and then check the names matched between the old and new textures.
B) Try all the values of texture cache accuracy. Although I'm told it shouldn't, it can affect the names Dolphin assigns textures, so if it isn't set to the same value as it was for the guy who created the texture pack, Dolphin will look for textures with different names to the ones they have. If you find the value they used, then it should start working.
c) There's a chance the names have been screwed up in some other way, which would mean you'd have to rename them all. To do that, you'd need to turn on Dump textures, and then check the names matched between the old and new textures.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56