High Sierra 10.13.6 would not install

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Level 1

11 points

High Sierra 10.13.6 would not install

As the title says, the latest update would not install on my 2017 highest-possible-end iMac. I recently had to do a Time Machine re-install of the whole thing (took over 40 hours); maybe this is somehow the reason?

It got caught in a loop where it'd try to update, tell me it couldn't, and if you just restarted it would try again. Quitting the installation program and choosing a start drive started the computer fine, but the update has obviously still not been applied.

iMac (Retina 5K, 27-inch, 2017), iOS 10.3.2

Posted on Jul 10, 2018 11:47 AM

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Answer 1

Top-ranking reply

Eau Rouge

Level 8

42,596 points

Aug 1, 2018 5:51 AM in response to Naiera

Open Disk Utility from your Applications/ Utilities folder, run First Aid. If it checks out ok open System Preferences> Users & Groups> Login Items, if there are any third party apps set to start at login highlight them and click on the minus button to remove them.

Download this, Download macOS High Sierra 10.13.6 Combo Update

Once downloaded double-click to install.

See if that completes.

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Answer 2

chris_g1

Community Specialist

Jul 12, 2018 7:02 PM in response to Naiera

Hello and welcome to Apple Support Communities, Naiera.
If I understand your post correctly, you're trying to update macOS and it seems to be in a loop where the update never completes. Keeping your system up-to-date is important. I'd like to help.
As always, it's a good idea to create a current backup before updating: How to use Time Machine to back up or restore your Mac
Have you tried to begin the update from safe mode? Here's how to enter safe mode:
Use safe mode to isolate issues with your Mac
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities. Take care.

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Answer 3

raina_b22

Community Specialist

Aug 1, 2018 5:33 AM in response to Naiera

Hello Naiera.

What is the exact error message you're seeing? If your Mac continues to return to the same screen, try the steps in this article for that screen:

About the screens you see when your Mac starts up

Cheers.

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Answer 4

Jul 13, 2018 6:46 AM in response to chris_g1

I have the same problem too. After update my macbook pro, it restart but don´t finish the update... i just have tried everything i read in forum, but nothing works. I don't have a Time Machine Backup, but i don't want loose my data from the disk.

Anyone who can helps me please.

Regards,

Helder

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Answer 5

Naiera Author

Level 1

11 points

Aug 1, 2018 6:31 AM in response to Eau Rouge

It worked! Thank you. I don't know if it was the auto-start programs (just SteerMouse, Dropbox and iTunesHelper) that were the problem; they've never seemed to get in the way before. The harddrive was working fine, of course. I check it regularly 😉

I've never seen that manually downloaded Combo Update recommended before; I figure that's what did it for me and it seems like something everyone should know about 😝 😉

Now the OS can finally stop pestering my about updating! 😀

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Answer 6

Naiera Author

Level 1

11 points

Jul 31, 2018 6:25 PM in response to chris_g1

Thank you. I finally tried to use Safe Mode to install, but this did not help at all. I received the exact same error.

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High Sierra 10.13.6 would not install

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