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Bobyzick Author

Level 1

4 points

My 2009 iMac 21.5" will not upgrade past High Sierra 10.13.3 and I was told my computer would be able to run on High Sierra 10.13.6. It will download from the App store but will not finish installing this upgrade. What is wrong with this Upgrade ?

iMac 21.5", macOS 10.13

Posted on Feb 27, 2019 2:35 PM

Top-ranking reply

MrHoffman

Community+ 2024

Level 10

126,145 points

Posted on Feb 27, 2019 3:38 PM

Download the macOS 10.13.6 combo update, and try applying that.

If that fails and if you have anti-virus or anti-malware or a cleaner or an add-on firewall, remove that per the vendors' instructions, reboot, and try applying the combo update again.

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My 2009 iMac 21.5" will not upgrade past High Sierra 10.13.3 and I was told my computer would be able to run on High Sierra 10.13.6. It will download from the App store but will not finish installing this upgrade. What is wrong with this Upgrade ?

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