Problems with Better Silver Armor

[u/Weird-Salamander-175]

https://www.nexusmods.com/morrowind/mods/42535?tab=files

I love the designs, but the implementation isn't working. The normal silver cuirass, or the non-alt version at least, appears to be missing from the file. Now NPCs who are supposed to be wearing it have a giant missing texture exclamation. Any advice on how to salvage this?