Most of the Mac users are unaware about the huge size of the Big Sur and the absurd time it takes to complete the installation. So, for most people, installation is running properly, but it is just taking too long, and they are just worried. But frankly, some people are having installation issues; if you are one of them, check out the article below.

installation failed an error occurred while installing the selected updates

Part 1. Why is My MacOS Not Installing?

There are a lot of factors at play here. If the update is not installing, it can be due to anything; starting from a weak internet connection to a problem with the Apple server. But before you get into it, let’s make one thing clear. The macOS Big Sur is a 12GB update. In no way is it small, and it won’t get downloaded quickly. So, it is safe to say that this update will take time.

But the fact is, even with the fastest internet connection, the complete download and installation take over 12 hours. So, keep everything in check and wait patiently for the download to get finished. But if there is an issue, check out the solutions below to get rid of the issue immediately.

Part 2. How to Fix macOS Installation Failed

Here are a few effective ways to fix the macOS installation failure issue. There have been a lot of issues with the download and installation of macOS Big Sur, but since then, a lot has been done to take care of this issue. But if you are still having, it’s time to fix.

Fix 1. Wait for Official Apple Server Fix

One of the biggest issues with macOS Big Sur is that it downloads really slow. Initially, it threatened the user by stating that it would take an entire day to get downloaded. It is a big OS. This situation indicates that the Apple server is being accessed by too many people at the same time, or there is something wrong with it. But you have to know the issue. So, you need to visit the Apple System Status Page.

You have to visit this page to find out what is going on with the Apple server and If Apple was able to fix it. All the information will be available here. On the 12th of November, Apple was showing ‘Users may Not Be Able to Download macOS Software Updates on Mac Computers’. This statement indicates that there was an issue.

installation failed an error occurred while installing the selected updates

Fix 2. Quit Software Update and Re-open it Again

macOS Could Not Be Installed on Your computer? If you haven’t been able to locate any issues with the Apple server, then the solution is simple. Just stop the software update immediately and start it again.

Fix 3. Reboot Your Mac and Try Downloading/Installing Updates Again

If installation failed, an error occurred while installing the selected updates; you need to reboot the Mac and try it again. You need to remember that the macOS Big Sur is 12GB, and it will take more than a while to download without a very fast internet connection. But even with fast internet connections, users have claimed that it took them more than 12 hours to complete the update. So, if you get an installation failed error during that time, it will be really frustrating, especially if you have continued the download for a few hours.

downloading macos big sur

Fix 4. Download The Updates Manually from Apple

Most of the users download the software updates using the mac launcher. This is not the best way to install the updates, especially not suitable for macOS Big Sur. So, you need to download the updates manually from the Apple Store. Just visit the following link and look for the updates:

Extra Tip: How to Download to Install Windows 10 OS

While we are troubled with the macOS Big Sur, we should also address the problem with the Windows 10 OS. The main issue with the Big Sur is its size, which is 12GB. Windows 10 is also close to the same size, and if you ever have to install the Windows 10 OS completely, it will be troublesome. But the internet is completely unaware of such issues with Windows users.

The reason is, professional tools like PassFab for ISO are available to download the required Windows system for you. It even helps to create the bootable disk. This is a very simple process. You just have to make some clicks, and all the work will be completed by this software. If you want to know more about the use of PassFab for ISO, check out the steps below.

  • Step #1: Complete the installation of PassFab for ISO on a computer and launch it. On the main interface, select the Windows System ISO and click on the download button. choose iso file in passfab for iso
  • Step #2: The download will take a while, so you have to wait. You will also be able to import the file. downloading iso file in passfab for iso
  • Step #3: Now, connect the USB drive to the computer and click on the ‘Burn’ button. start burning the disk in passfab for iso
  • Step #4: A notification panel may pop-up stating that all the files on that drive will be erased. Click on ‘Continue’ to proceed. confirm burn usb in passfab for iso
  • Step #5: Wait a while. After the disk burning is complete, you will be notified. After you have created the bootable disk, you have to connect it to the computer where you want to install Windows. So, connect the bootable USB to the computer and reboot. Access the Boot Menu.
  • Step #6: In the Boot Menu, choose the boot device and enter the installation process. entering windows installation in passfab for iso

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Final Thought

Therefore, it is not easy to successfully install Big Sur. A lot of users have faced issues during the inevitable launch, but even after that, a number of users are having an issue. The worst part is, it takes a lot of time to download and install the OS. Some people have wasted days just to install the macOS. So, just be patient. But if you are a Windows user and ever feel the need to install the Windows OS, you have nothing to worry about. PassFab for ISO is available, and it does a smooth job.

PassFab for ISO box
  • Support Windows 10, Windows 8.1, Windows 8, Windows 7, etc.
  • Support USB of various brands, such as SanDisk, Kingston, etc.
  • Support burning ISO to USB flash drive, CD or DVD-ROM
  • Support GPT and MBR partition types