Download and unzip the fille, in the unzipped carpet you have got a blend file and a texture carpet, only you need open the blend file with blender 2.81 and press render :D.
Warnings and suggests:
- This scene is a bit complex, so you need a lot of ram (in my case this scene use 7 gb of ram and 3 gb of vram).
- If for a reason the textures are missing.
Go to: File -> External Data -> Find Missing Files, find and select the textures carpet.
- Please open this scene in blender 2.81 not in 2.80 because the mapping node are changed and blender 2.80 can't read this.