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I have been updating the macOS from 10.12.4 to 10.12.6 . For this I have downloaded the macOS dmg file from the Apple website. But when I go on for installing the macOS then I see this error.

Screenshot: Install macOS Sierra Update

I have around 100GB of space but its still not updating the OS. What should I do about it. I need to install "Xcode" from the App Store but when I go on for installing it gives me the error that it needs the OS update to be 10.12.6 How can I fix this up?

The version I am working on is 10.12.4 Screenshot: Mac info

shikher.mishra
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  • Which update exactly did you download? Was it the "Update", which would probably fail, or the "Combo Update", which would probably work? (See this question for the difference: https://apple.stackexchange.com/questions/80657/what-is-a-combo-update-and-how-is-it-different-than-the-regular-update ) – Matt Gibson Sep 30 '17 at 20:14

4 Answers4

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I just bought a reconditioned MacBook Air running macOS High Sierra 10.13.4 and as I wanted to upgrade to macOS High Sierra 10.13.6, I ran into the same problem. I tried everything and was about to give up, until I stumbled the following page:

and realized that FileVault was still encrypting my hard disk and that was blocking any macOS update.

Nimesh Neema
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Olivier
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  • Yes! Thank you for this, also your laptop needs to be on adapter power for the encryption to keep running. Thanks! – DJTano Apr 08 '20 at 21:17
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In my experience, downloading and installing the Combo Update sometimes works when the Delta update fails. Please edit your question to indicate the specific Mac model you are working with.

IconDaemon
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In very simple words. You need update .dmg file which is COMBO.

Apple has 2 types of updates Delta and Combo. Delta. You can only update Version +1. Ex . If you have 10.15.2 and you download 10.15.5, Mac will provide this error but it will allow if you download 10.15.3.

Combo. It contains all delta + new update and you can download and install without an issue. Delta kind of check doesnt apply for combo

Ninad
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Since you have the full installer, I would make a bootable USB installer if you have a spare 8 GB drive lying around.

Search Apple or this site for the createinstallmedia command that you can run from the command line (terminal.app) and make the full installer into a bootable image.

Then restart with the USB and hold option key. This works when your system isn’t bootable at all and much better than just a combo updater or the install app on your main OS.

bmike
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