Vray 4.2 Sketchup 2020 __full__ [Editor's Choice]
You can open files made in older V-Ray versions, but they may need minor adjustments to materials.
: To maintain performance, keep texture sizes under 2500x1500 pixels and use SketchUp's Tags (Layers) to hide elements not currently being rendered. Getting Started and Support Vray 4.2 Sketchup 2020