The Marmoset Viewer file you can see in the Product preview, has been setup with the material generated by plugging the texture maps given in the archived file.
Material Setup Info:The archive named 'textures' consists of 3 folders which contain texture maps for different engines:
Generate the materials by simply plugging any of the required skin set of texture maps.
The material thus generated must be linked to all 11 parts of model.
You are ready to go!
Please follow your game engine guideline to setup the materials.