This is Mitesh from PlasmaStudio.
The zip file you downloaded includes :
1) 1 Diffuse Map
2) 1 Specualar/Reflection Map
3) 1 Roughness Map
4) 1 Normal Map
5) 1 Displacement Map ( We've not used this in the preview but provided for extra realism )
6) 1 Ambient Occlusion Map ( We've not used this in the preview but provided for extra realism )
All textures are well named so you'll know which texture for what purpose.
One Blender file provided so you will know how to use.
If you still need assistance contact me via my CgTrader's profile page.
Thank You for purchasing my product.