to your RealVNC account (for cloud-managed subscriptions).

Which (e.g., RealVNC 7.x, TightVNC) you are using. Your operating system ( Windows, Linux, or macOS ).

You may have exceeded the number of concurrent connections allowed by your license.

and doesn't require license keys or serial numbers, you might consider: (Great for Windows) (High performance, cross-platform) (Includes easy file transfer and chat) troubleshooting a specific error message, or are you looking for a new license for a specific number of computers?