Installer may use different credentials than those used to log in

The basic idea is that the user may still edit the login form after login button has been clicked.

Authentication will use the values from the moment the button was clicked. But if the user for some reason changes the fields during authentication, the installer will use the most recent values. Hence one can successfully log in and then get a failure when i.e. an authenticated download is needed or later when launching CDK during box registration.