If you are on SketchUp 2021, Chaos and Trimble generally recommend moving to V-Ray 5 or newer, as these versions were built specifically to support SketchUp 2021's updated architecture. Key Features of V-Ray 4.2 (V-Ray Next)
Since official sources (Chaos Group) do not provide a compatible link, users searching for this specific string are likely looking for legacy installers or unofficial workarounds. This introduces distinct categories of risk. Download Vray 4.2 For Sketchup 2021