This page provides some information on how to get V-Ray up and running.
The V-Ray installer for Rhino is straightforward and easy to follow. It can be downloaded from the Downloads section of the Chaos Group website (please make sure you use your login credentials to ensure access to the download links). Before installing V-Ray, it is recommended to check that your computer meets the System Requirements for running Rhino with V-Ray. If you would like a step-by-step guide, please check out the Installation of V-Ray for Rhino page.
Once V-Ray is installed you will want to make sure that your V-Ray license is properly configured. The Set up your V-Ray License page includes everything you need to get V-Ray licensed and running properly.