If you are having difficulty installing V-Ray 3, please see notes for your operating system, below.
Windows
Windows 8 Internet Explorer may present an alert: "Windows Smartscreen prevented an unrecognized app from running. Running this app might put your PC as risk." Click in the "More Info" link beneath this message to reveal the option to "Run Anyway".
Mac
If you receive an Unidentified Developer error during installation on macOS 10.15 you will need to bypass the installation protocols.
1. After receiving the message, click the Apple icon in the top-left corner of the screen, then choose System Preferences from the drop-down menu.
2. Choose Security & Privacy from the list.
3. Once in Security & Privacy, click the lock icon at the bottom of the window so that you can interact with it. It will have you enter your account password
4. At this point you will see “Allow apps downloaded from:” set to “App Store and identified developers.” If it is not, set it that way, then retry installation.
5. If it is, you should see a message beneath it reading ‘“Install_VRay_for_formZ9_Pro” was blocked from opening because it is not from an identified developer.’ Click the “Open Anyway” button to the right of the message and the V-Ray installation should continue normally.