There are 2 files "Hundested_armchair.blend" and "Hundested_armchair_blender-3-3.blend". If you are using Blender version older than 3.4 use "Hundested_armchair_blender-3-3.blend" instead, becouse in fabric materials the new mix color node (old mixRGB) is not compatible with older Blender versions. Model is tested down to Blender 3.0 and it worked perfectly.