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Via Software Update
Click the Apple menu, select System Preferences
Click Software Update
Click the Check Now button to check for updates
* You can select Check for updates (and set it to Daily, Monthly etc.) and Download updates automatically if you want to have the latest updates downloaded automatically
If software updates are available, the window below will appear. Quit all running applications, if you use a laptop, connect it to a power source, unplug unnecessary devices from your Mac OS computer (e.g. printers or USB hubs) -> select all the software you want to update -> click Install Items