how to find software update
How do I update my Mac ios version to the latest.
iMac 27″ 5K, macOS 10.13
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In 10.13 you use the App Store.
Or...
Try installing this in Safe Mode, but not using Firefox...
https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12
Safe Boot, (holding Shift key down at startup).
