Since your request is a bit brief, I have interpreted this as a search for download links, installation guidance, or information regarding compatibility for V-Ray for Revit versions 2016 through 2021.
Post-Production in Revit: The new Frame Buffer allowed for Light Mixing—changing light colors and intensities after the render was finished—removing the need for Photoshop for basic adjustments. V-ray for Revit | Digital story of an architect vray for revit 2016 2021
Disclaimer: Autodesk Revit is a trademark of Autodesk, Inc. V-Ray is a trademark of Chaos Software EOOD. Always verify version compatibility before installing plugins as software updates can change API dependencies. Since your request is a bit brief, I
If you are installing on older Revit versions, keep these points in mind to avoid errors: The IFC Route: Export your Revit 2016 model