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Then follow the instructions for the version of the MacOS you have. In Software Update you could also check to see if any updates have previously been ignored. Before you do make sure your audio interface MIDI devices and audio software DAWs plug-ins are compatible with the new OS.
Thats why most Mac users with old devices try to update their Mac to OS X El Capitan. If any updates are available click the Update Now button to install them. From the Apple menu in the corner of your screen choose System Preferences. Click on Software Updates and your Mac will check for available updates.
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