Official license keys for 5.x are no longer available for purchase or viewing in new accounts. Users are encouraged to upgrade to RealVNC Connect (version 6.x or 7.x).
If you previously installed VNC 5.0.5 and need to retrieve your own key, it may still be stored locally: Windows Registry vnc 5.0.5 license key
For version 5.0.5, a license key was required to activate the during installation. While "free" keys are sometimes circulated in community forums or social media, using them can pose significant security and legal risks. Official Ways to Get a Key Official license keys for 5
command may reveal information about a currently applied offline license. Why Upgrading is the Best Move vnc 5.0.5 license key