I recently downloaded one of Kitbash 3D's scene kits, for use in Blender. The download comprises two parts: a Blender-specific file containing the buildings, and a folder containing all required texture files.
The building file loads successfully in Blender, but buildings are displayed in a default colour (bright purple!). Blender users will know that in the program's Shading set up, texture files are attached to a system of nodes. Now, when I looked at my Blender, it looked like the texture files were in place, but somehow weren't being 'read'. As an experiment, I tried replacing one of the dummy textures with a copy from the folder - and it worked!
I'm sorry if I haven't explained this very clearly. However, I hope someone might be able to give me a nudge in the right direction.