Good luck re-assigning 135 textures by hand when importing the FBX ! Only way to import this asset is installing Unity, importing the unity package, installing FBX exporter, exporting the asset in fbx with embeded textures, importing it in blender. Why not just doing that by default ?? if it's texture size the issue then just use jpeg, we can't buy a 20$ asset and spent 100$ worth of human time just to rebuild all the materials by hand ... Even using unity it's a pain, full of useless textures like emission, spec and alpha that takes up Vram without having any data inside...