Make sure that you are on the General tab
and unlock the pane. Click the Allow
button that appears in the lower section of
the pane.
You will then be prompted to reboot your
system - click the “Not Now” button and
close System Preferences. You will be
taken back to the Installer window - click
the “Restart” button there to complete the
installation.
Checking the Status of the Driver Installation
Once the system has rebooted, hold down the OPT key, open the Apple menu and
select “System Information …”
