With Professional or Enterprise subscriptions, System Authentication is the default. More advanced instructions for getting started on Linux can be found here: Scripting Deployment and Start-up on Linux. If you have a subscription that includes offline licensing, you can register offline using your license key, available from the Deployment page of your RealVNC account. When the VNC Server Licensing Wizard appears, apply your subscription to VNC Server by signing in using your RealVNC account credentials.Click the Install VNC Server button and follow the on-screen instructions, entering your sudo/root password when prompted.Extract the installer in your Downloads folder using your system's file manager, and run it by double-clicking the VNC Connect installer application icon.Download the combined VNC Connect installer to the computer you want to control.Note: If you have a Raspberry Pi running Raspberry Pi OS (previously called Raspbian), VNC Connect is pre-installed and pre-licensed so all you have to do is follow these instructions to enable it. To subscribe to VNC Connect, see How do I subscribe to VNC Connect? On the computer you want to control The video below shows you how to get started: