Version Corona - 1.5
The model uses materials that may not be displayed correctly in very old versions of the engine.

For proper operation, check that the units of measurement in the scene are in mm:
Customize - Units setup - System unit setup - mm
The carpet material is made using the Displacement card (make sure that Displacement is enabled in your scene settings)

https://schumacher.com/catalog/products/R73670004 

More carpets: http://3dsky.org/collection/shared/5321350