An error occurred installing mac os

If an error occurred while updating or installing macOS

The message might say that an error occurred while downloading, preparing, or installing, or that the installer is damaged or could not be verified.

The cause of messages like this can vary, and sometimes they are only temporary. If the message recommends a solution, such as to redownload the installer and try again, please try that first. The other solutions here are organized starting with the easiest. If the issue persists or you need help, please contact Apple Support.

Check your internet connection

Even if you’re not installing macOS from the internet, the installer needs the internet to get firmware and other information specific to your Mac. Make sure that your Mac has a working and stable internet connection.

Install in safe mode

Install while your Mac is started up in safe mode. To start up in safe mode, determine whether you’re using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Shut down your Mac.
2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”
4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac.
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.

Install after repairing your disk

Install from macOS Recovery

Install while your Mac is started up from macOS Recovery. This gives you the latest version of the macOS currently or most recently installed. To start up from macOS Recovery, follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

Intel processor

Turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you’re asked to select a user you know the password for, select the user, click Next, then enter their administrator password. When you see the utilities window in macOS Recovery, select Reinstall macOS, then click Continue and follow the onscreen instructions. Learn more about using macOS Recovery to reinstall.

Install after erasing your Mac

If no other solutions work, erase your Mac, then reinstall macOS or restore from a backup.

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Question: Q: Hardware error installing High Sierra but Sierra installs fine

I’ve tried a million times installing High Sierra but it always fails with:

«an error as occurred installing macOS. To use Apple Diagnostics to check your Mac hardware, shutdown, press the power button, and immediately hold ‘D’ key until diagnostics begins. Quit the installer to restart your computer and try again.»

Have run apple diagnostics from internet and other and it doesn’t detect any kind of problem

Sierra on the other way installs fine.

I have a late 2011 MacBook Pro 17» maxed with 16GB ram and two Samsung 850 Pro SSD.

Already tried to downgrade memory a to keep only one SSD and still can’t install High Sierra.

Tried to do and upgrade from Sierra and also a clean install to no avail.

Did a manual firmware upgrade to the one built in High Sierra installer and it didn’t make a diference.

The only thing haven’t tried is to swap the SSD for a HDD because I currently don’t have one.

Have you guys any other idea that I can try?

MacBook Pro (17-inch Late 2011), macOS High Sierra (10.13)

Posted on Oct 16, 2017 1:13 AM

All replies

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The failure could be due to one of two unsupported hardware modifications. Those failures almost never become apparent until macOS upgrades, updates, or the firmware updates that accompany them are installed.

Replace that notoriously problematic SSD with one from a manufacturer known to support Macs.

The maximum supported RAM configuration for that model MBP is 8 GB. Unsupported memory configurations will result in unexpected operation. To learn how to upgrade memory refer to the Memory Upgrade Instructions in About This Mac.

Oct 16, 2017 6:25 PM

Hi, thanks for your reply.

I dont know if the Samsung 850 Pro is a notoriously problematic SSD, what I Know is that it as been working steady, reliably and speedy since 2014 and Yosemite and every other macOS version since then in this same machine. and a Samsung 840 Pro before that.

As I’ve referred Sierra installs fine, no problem whatsoever (have had to do it 4 times this past month, because High Sierra broke every upgrade attempt)

Never had a single hardware problem with this Macbook Pro late 2011, and have been able to setup every single OS X or macOS without any problem until now.

About the maximum supported RAM, your are right, it is 8 GB. But I’ve been using 16GB from day one without any problem.

I’ve run Apple Hardware Diagnostics enumerous times without falling once, and I’ve taken the macbook to an authorised repair center and they’ve run all the oficial diagnostics and found no problem.

I think Apple has done a poor job with the High Sierra installer, and that this problem is due to it.

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Ошибка при чистой установке Mac OS X

При установке OS X El Capitan или OS X Yosemite могут появиться ошибки:

«This copy of the Install OS X El Capitan application can’t be verified. It may have been corrupted or tampered with during downloading» или «This copy of the Install OS X Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading», ну или «An error occurred while preparing the installation. Try running again».

«Не удалось проверить этот экземпляр программы Установка OS X Yosemite (Mavericks). Он мог был быть поврежден или подвергнуться изменениям в процессе загрузки.»

Иногда они могут быть решены путем простой перезагрузки и попытки переустановки OS X еще раз (или повторной перезаписи дистрибутива на флешку/диск, если он был поврежден), но если сообщения об ошибках появляются постоянно, то можно решить проблему только сменой даты на вашем Mac.

Меняем дату на Mac

Сделать это можно не выходя из меню установки, использовав терминальные команды. Для этого запускаем «Терминал» и вводим команду:

После чего вам отобразится установленная в данный момент дата. Ее нужно поменять, задав дату выпуска дистрибутива.

Дата и время вводятся в определенном формате: [mm]dd]HH]MM[[cc]yy]. Расшифровывается это так: Месяц Число Часы Минуты Секунды Год, введенные без пробелов и, обязательно, в такой последовательности.
К примеру, если нужно установить дату и время на 24 октября 2015 года 18 часов 25 минуты, то команда будет выглядеть так:

Смысл в том, чтобы выставить дату, позже выпуска вашего дистрибутива, но раньше выпуска следующего обновления. Экспериментируйте!

После этого закрываем «Терминал» и начинаем процесс установки.

Если вы нашли ошибку, пожалуйста, выделите фрагмент текста и нажмите Ctrl+Enter.

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Question: Q: An error occurred installing macOS

An error occurred installing macOS. To use apple diagnostics to check your mac hardware, shut down, press the power button, and immediately hlod the ‘D’ key until diagnostics begins. How can i fix thi problem can anyone suggest me please

How can I fix this problem

Posted on Jul 27, 2020 3:39 PM

Repair a storage device in Disk Utility on Mac

Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.

If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.

1. In the Disk Utility app on your Mac, choose View > Show All Devices.
2. Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD — Data).
4. In the sidebar, select a disk or volume, then click the First Aid button .
5. If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.
6. Click Run, then click Continue.
7. If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.

• • If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.
    • If you can replace a file or re-create it, delete it.
    • If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.
  • If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.

If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.

If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.

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Question: Q: An error occurred while installing Mac OS X

My MacAir 13″ Mid 2012 had the El Capitan latest version 10.11.5 installed. Suddenly a morning a few days ago it starting misbehaving, getting stuck, and when rebooting the system it appeared a screen with a folder in the center with a ¨?¨in the center. Sometimes it managed to reboot the system to get to the desktop screen but getting stuck again and again. I rebooted the system in Safe Mode, deleted some login items, suspecting an item might be troubling the starting process, but it did not help.

My decision was to restore the system installing the El Capital again after formatting the hard disk, but now the problem was another: The download was good, but when installing just a few minutes before finishing an error appeared on the screen saying: An Error Occurred While Installing Mac OS X. And I tried, tried several times until I decided to take it to the authorized technical service, but they could only installed the El Capitan 10.11.1 arguing that they it was the only version they could manage to installed after several trials in installing the El Capitan 10.11.5

So, they did not solve the problem fully, cause now it seems I am not able to have the latest version of El Capitan, and now I am not sure if I run the restoration via Time Machine because the problem could show again.

1- Somebody know how to fix this, installing the latest version without having the Error message?

2. If not, what happens if I restore from Time Machine on this version of El Capitan 10.11.1 if I had the backup from a newer version 10.11.5

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