I checked the .blend and Blender says “No packed files to unpack,” and I also searched my entire drive for the referenced .dds textures, but they aren't included anywhere in the download.
Could you please just send me the complete texture folder/files separately? That would be much easier and would let me get the asset working without having to track down every missing texture individually.
I also tried different Blender versions just in case — 3.0, 4.0, 4.5, and 5.2 — but the same problem occurs in all of them. Again i might just be dumb here but a texture folder will make it easier for future.