Those who work in versions of V-Ray below 3.1, be careful. In the materials of the BRDF section, Microfaset GTR is installed; if the version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - whichever is more convenient for you...
Manufacturer's website: https://ifdesign.com/en/winner-ranking/project/calmo/646015