There are 5 models in the scene.
– oven H7860BP 600 mm white;
– oven H7840BP 600 mm white;
– island hood MIELE DA 6708 D white;
– hob MIELE KM 7474 FR 800 mm;
– refrigerator MIELE KFN29683D white;

https://3dsky.org/3dmodels/show/kollektsiia_bytovoi_tekhniki_miele_04_1 
https://3dsky.org/3dmodels/show/kollektsiia_bytovoi_tekhniki_miele_06 
https://3dsky.org/3dmodels/show/ostrovnaia_vytiazhka_miele_6708_d_1000_mm 
https://3dsky.org/3dmodels/show/keramicheskaia_elektricheskaia_varochnaia_poverkhnost_miele_km_7474_fr_800_mm 
https://3dsky.org/3dmodels/show/dvukhkamernyi_kholodilnik_miele_kfn29683d_v_trekh_tsvetakh 

Each model consists of several elements everything is assembled into one object and multi-material is assigned. All materials were renamed and simplified as much as possible I converted the Corona Render materials and did NOT check them in the scene for rendering check the model in a separate scene.

The FBX file contains all the models with materials. There are no materials in the OBJ file only geometry.

Who works in V-Ray version lower than 3.1 be careful in the materials in the BRDF section there is Microfaset GTR (GGX) if your version is older than 3.1 then the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.