Hi! I just want install VirtualBox 6.0.14 on MacOs Big Sur
Uninstall previously version
May be security settings not allowing it to install?
System Preferences’ => ‘Security & Privacy’ allow Oracle then try install again
Did you reboot and tried to start VB
Read in VM forums it works sometimes even with installation failed error
or it could be compatibility issues
https://forums.virtualbox.org/viewtopic.php?t=95569