Corona version 9
The model uses materials that may not be displayed correctly in very old versions of the engine.

Workplace from FRAMA:

– modular shelving: https://framacph.com/products/shelf-library-triple-section-stainless-steel-h1084-w80?pr_prod_stratuse_description&pr_rec_idd0e158702&pr_rec_pid7541711536316&pr_ref_pid7541710389436&pr_sequniform 
– Triangolo chair: https://framacph.com/collections/seating/products/triangolo-chair-steel 
– T-Lamp: https://framacph.com/collections/shop/products/t-lamp-steel 

Objects are partially attached textures and materials have logical names
Texturing UnwrapUVW

For Corona render it is recommended to install a version not lower than 1.5 since the glossiness of materials is configured with PBR in mind

Who works in a V-Ray version lower than 3.1 be careful there is a Microfaset GTR ( GGX) in the materials in the BRDF section 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