Vnc Viewer 5.0 5 License Key ((better)) -

The official successor; offers better security.

If you already own a 5.0.5 license and need to recover it for a re-installation, you can try these methods: Where is my license key? - RealVNC vnc viewer 5.0 5 license key

What are you connecting together (e.g., Windows to Linux)? The official successor; offers better security