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Then open Windows Start > Settings > Apps > Apps & Features > V-Ray for Rhinoceros or alternatively run C:\Program Files\Chaos Group\V-Ray\V-Ray for Rhinoceros\uninstall\Uninstall.lnk lnk .
This will start the V-Ray uninstaller. Follow the on-screen instructions to remove V-Ray from your system and restore any files overwritten by the installation.
After the uninstallation is completed you can check C:\Program Files\Chaos Group\V-Ray\V-Ray for Rhinoceros and %AppData%\Chaos Group\V-Ray for Rhinoceros for any leftover files.