There are four models in the scene the difference is in color and size.
It’s called differently on different sites.
There are no additional plugins.
The model is created in millimeters
The models are named after themselves; when downloading you can select the color option you are interested in
The model is configured for Corona renderer AND V-Ray

Dimensions Maya_800
Height 800mm
Width 80mm
Depth 70mm

Dimensions Maya_600
Height 600mm
Width 80mm
Depth 70mm

For Corona render it is recommended to install version no lower than 1.5 since the glossiness of the materials is adjusted taking into account PBR

Those who work in a 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 – whichever is preferable for you