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

STRINGLINE string lighting system from Centersvet

Overhead lamp in the form of a stretched string with an LED strip that shines upwards. The light is reflected from the ceiling.
The length of the tape is possible up to 6 12 and 20 meters

There are several options in the scene (shown in the secondary previews)

https://www.centersvet.ru/catalog/stringline_system/stringline/?id49922&temperature3000&mkeydefault 

Objects are logically honed textures and materials have logical names
Texturing UnwrapUVW
Vray materials are obtained by conversion

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