Navigate to your V-Ray installation's bin folder. For Windows, this is typically located at: C:\Program Files\Chaos Group\V-Ray\3ds Max NNNN\bin or C:\Program Files\Chaos Group\V-Ray\Maya 20XX for x64\maya_vray\bin .
How to install the material library in offline mode? - Chaos
If your installation did not include the full library or you need to move it to an offline workstation, follow these steps:
Move the downloaded material folder so it sits directly next to the V-Ray universal installer file ( .exe ). Do not rename the folder.
Confirm the path and start the process. The library requires approximately of free space. Installing the Library on an Offline Machine
In your 3D software (e.g., 3ds Max), ensure the external file paths point to the library assets. Go to File > Project > Configure Project Paths > External Files and add the main library folder and its Assets subfolder. Using the Library in V-Ray 6