After installation, you will need to activate V-Ray 4.2 for SketchUp 2021 using a valid license key. Follow these steps:
Will there be an Installer of V-Ray 4/ Next for Sketchup 2021? download vray 42 for sketchup 2021 link
To ensure stability and access to the latest features, it is recommended to download the latest compatible version directly from the manufacturer. After installation, you will need to activate V-Ray 4