The model was created in the 2018 version and saved in the earlier 2015 version.
OBJ format is also available.
There are no third-party plugins, all elements are called by their proper names.
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,

(SINGLE)-(SCENE IN MILIMETERS)
Finish: White/Antique Brass/Silver
Materials: Metal/Glass

Overall: 13"H x 5.5"D.
Adjustable height: 13 to 130 inches.
Weight: 3 lbs

(3 LIGHTS) - (STAGE IN MILIMETERS)
Finish: White/Antique Brass/Silver
Materials: Metal/Glass

Overall: 13"H x 9.5"D.
Adjustable height: 13 to 130 inches.
Weight: 4 lbs

The faceted shades of the Glace White Round 3-Light Multi-Drop Pendant are made of panes of white art glass joined with seams of metal in an antique brass finish. The organic shape of the shades and the fact they hang at differing heights enhance the personality of this white pendant, which will ornament a space like a piece of jewelry. Art glass is one of the most artisanal materials that can be used, as its swirling opaque surface creates a milky glow whether lights are switched on or not. The canopy of this piece is luminous in a painted silver finish.
Finish: White/Antique Brass/Silver
Materials: Metal/Glass
(SCENE IN MILIMETERS)
Overall: 13"hx 9.5"dia.
Adjustable Height: 13" to 130"
Weight: 4 lb

https://southernlightsinc.com/glace-white-1-light-multi-drop-pendant-92-9000-1033/ 
https://southernlightsinc.com/glace-white-3-light-multi-drop-pendant-92-9000-1034/