Big Sur Installation Failed on MacOS

OS Big Sur for Mac was introduced in 2020. This version of the operating system is considered one of the fastest, most functional, and modern. However, some users are unable to upgrade their MacBook, iMac, or Mac Mini to this version of the OS. Read this article if you want to fix the issue when Big Sur installation failed on your Apple computer.

What to Do When You Are Unable to Install Big Sur on MacOS?

There are several reasons why Big Sur installation errors occur:

  1. Lack of connection to Apple servers. To update or install this version of the operating system, you need stable and fast Internet access, as well as a connection to Apple servers. In some cases, the connection may be disrupted. You may want to try installing the OS later when the Apple servers are working again.
  2. Lack of free space on your Mac’s SSD or HDD. According to system requirements, Big Sur requires at least 15 gigabytes of free space to download and install.
  3. An older version of Mac that does not support the newer version of Apple’s OS (you will only be able to install Big Sur on computers from 2013 or later). The iMac Pro only supports Big Sur on the 2017 version or later.

If the macOS Big Sur installation failed, make sure you are following the correct sequence. You may not be installing the operating system correctly, and it causes the error.

All of these reasons lead to failures when installing the Apple operating system on a new drive or when upgrading an already used version of the OS.

How to Get Rid of Failures when Installing Big Sur?

There are several ways to get rid of crashes when installing or updating your OS Big Sur. All of these solutions can be performed without using additional programs, services, or applications. Start with the simplest one:

  1. Turn your Mac off and then turn it on again. In 30% of cases, this helps get rid of an error with a connection failure to Apple’s servers. Note that this method only works if you already have an operating system installed and just want to update it.
  2. Check for free disk space on your computer. There should be more than 15 gigabytes free.
  3. Uninstall the “Install Mac OS11” file before trying to download and update macOS again. If the first installation or update failed, restart your computer and try again, removing the file before doing so.
  4. Log in to the App Store again. In some cases, this solves the problem with an incorrect operating system update.
  5. Re-download the OS installation file only from the official Apple website.

How to Install or Update Big Sur Through the App Store or Apple Website?

You may face an error when upgrading or installing OS Big Sur because you are not doing it correctly. Choose only the official source of the installation or update. There are two ways to do this:

  • Go to the App Store, type Big Sur into the search box, and go to that macOS page. Then click “Download” and wait for the download. Open the operating system’s download file and follow the instructions, and then Big Sur will be installed on your macOS version 10.9 or higher.

big sur installation failed

  • You can also download Big Sur from Apple’s official website and install it from your computer.

macos big sur installation failed

Do not use third-party sites to download updates or the full version of macOS.

We hope you find our tips helpful. If you can’t fix the problem, run a diagnostic test on your computer or try to reset it to factory defaults.

Cyril Kardashevsky

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