Download the exact installer matching your Revit year from the Chaos website. You cannot install V-Ray 5 for Revit 2016.
Here is a helpful post organizing the necessary information, stability notes, and how to access the software legally and safely. vray for revit 2016 2021
Here is everything you need to know about running V-Ray for Revit across this specific generational gap. Download the exact installer matching your Revit year
A real-time engine that allows users to explore their Revit models in a game-like environment while they design. vray for revit 2016 2021