Thanks Scott, I already removed the license key.
Glen, the password it is asking for is the password of your user under macOS.
However...
As the warning says, it only does this because suddenly your virtual machine wants to sniff everything on the network. If you didn't change anything, no new VM's, no new network sniffing software etc... then this is highly suspicious and your virtual machine might be infected with some malware.
So unless it is expected that your virtual machine sniffs your network, you should NOT enter that password.
Instead you should probably contact a more technical person and/or go back to a known good backup of your VM.
hope this helps,
--
Wil
