https://www.terzani.com/en/products/preciousdesign/harpe?id=221&filter=new 

It is recommended to install Corona version not lower than 1.5, since the glossiness of materials is configured taking into account PBR.

Those who work in V-Ray version lower than 3.1, be careful, in the materials in the BRDF section there is Microfacet GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - what is for you preferable