If you are using Mac OS X Ver.10.10 or 10.11, you need to run Driver Loader, a preparatory application, before updating the system software.
NOTE: Upon running the Driver Loader, it will ask for your administrator password. After typing the password and clicking the OK button, the window prompt will close and seems like nothing happened. The computer needs to be restarted for the update to take effect.
If you are using Mac OS X Ver.10.9 or earlier, you do not need to run Driver Loader.
For details on downloading and running Driver Loader, refer to the instructional Web page of each camera system software update.