In this tutorial we will be looking at the steps required to turn
off the automatic download of update on a Mac OS. If you only want to manually check for available updates then you can make the necessary changes to the System Preferences.
In the System Preferences window, click the Software Update option under System section.
In the Software Update window, un mark the check box with label as “Download updates automatically“.
By this way you can disable the automatic download of updates on a Mac system.