Large enterprises with site licenses may have access to the RealVNC Offline License Generator tool. This is a small utility provided by RealVNC sales that runs on a disconnected machine to generate keys on-the-fly without contacting support each time.
If you have this tool, you simply:
Cause: You generated a key for RealVNC Enterprise 6.x, but you installed RealVNC Server 7.x. Fix: Uninstall the current server. Download the legacy version matching your license, or contact sales to upgrade your license to a newer version. realvnc offline license key new
Assuming you have a valid Enterprise subscription or a perpetual offline contract, here is how to generate a fresh key. Large enterprises with site licenses may have access
If you received an .rfx file (commonly offline_license.rfx): Cause: You generated a key for RealVNC Enterprise 6
sudo systemctl restart vncserver-x11-serviced