I cannot import this to Unity 6.2 with 1.3 .. the material is just pink. If I convert it to URP, it just gets white... I am new to Unity, not sure what is going on... I am assigning the textures manually but the result isn't like the one I created ..
This is a bug in AMD drivers which has been fixed in Adrenalin 25.9.2. Update your graphics drivers to the latest version.
If you still run into the issue, you could force Material Maker to run on Direct3D 12 using the --rendering-driver d3d12 command line argument, but this isn't guaranteed to work as I don't think Material Maker has been tested with it.