Once you have the key (typically via a USB drive or manual entry), move to the offline machine: VNC Server application.
You can find your offline license details within your RealVNC account portal: Log in to the RealVNC Connect Portal . Select from the left-side menu. Click on the Deployment tab.
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You must retrieve your license from the RealVNC Connect Portal . Sign in to your RealVNC account. Navigate to on the left menu.