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Macbook Reset an Error Occurred While Preparing the Installation Try Running This Application Again

macOS installation failed error in Software Update

Some Mac users have run into an error when attempting to download or install system software updates that says "Installation failed, An error occurred while installing the selected updates." This alert comes up in the Software Update system preference panel, and has been encountered in macOS Large Sur, macOS Catalina, macOS Mojave, and prior versions also.

There are a variety of reasons Mac users may come across the "installation failed" error when trying to download and install a particular MacOS software update, and we'll go through some troubleshooting steps to help resolve the upshot hither.

Troubleshooting macOS "Installation failed, An error occurred while installing the selected updates." Errors

We'll go through a diversity of troubleshooting steps, as well as offer an alternate solution to download macOS installers even if the System Preference panel for Software Update is repeatedly showing failure errors.

Wait a bit

Users may run across failures to download and install macOS updates when Apple servers are overloaded, therefore sometimes simply waiting a bit can exist helpful. This is especially relevant if the software update you are trying to install is brand new, similar a major organization software release (this happened with Big Sur for example).

Reboot the Mac

Sometimes simply rebooting the Mac and trying again can resolve the failed installation error.

Make certain the Mac is online and functionally connected to the internet

Some Mac users have encountered the Installation Failed error because their Mac has dropped an net connection, or because of a DNS result.

In either case, make sure the Mac is online, and easy way to do this is by opening Safari and going to a corking website like https://osxdaily.com and make sure information technology loads and works as expected.

If y'all're having DNS issues, you may want to cheque to see if custom DNS has been gear up on the Mac (or at the router level), or if your ISP DNS servers are offline. If those name servers are not functioning you may encounter diverse problems with downloading software updates, amongst other problems. Using Google DNS 8.8.8.8 is a common DNS for many users, as is OpenDNS 1.1.1.ane.

Make Certain MacOS is Not Enrolled in Beta Updates

If you lot're trying to download a final version of MacOS only it's failing, you lot may still be enrolled in the beta program. Some users have experienced this and found that unenrolling from the beta updates resolves the Installation Failed error.

From the Software Update arrangement preference console, click on "Details" and cull "Restore Defaults" to unenroll from receiving Mac beta updates.

Try downloading the macOS installers directly

This is more of a workaround, as it bypasses the Software Update system preference panel on the Mac, but you can try to download the macOS installer via App Store or direct download link from Apple, downloading the full macOS installer application directly using the control line, or by using the excellent gratuitous third political party app MDS (Mac Deploy Stick).

If you become with the MDS route, download and install the application (it's free from the developer TwoCanoes and can be downloaded hither), then launch the MDS app and choose "Download MacOS" from the sidebar, selecting the version of macOS arrangement software you desire to download and install.

downloading macOS installers with MDS app

In one case you accept the full installer of macOS, you should be able to launch it directly without experiencing the 'installation failed' mistake as you run across it but in Arrangement Preferences.

For what it's worth, this problem has been seen periodically over time with various macOS system software versions.

It looks like this in modern macOS xi (Big Sur) and later:

macOS installation failed error in Software Update

And it looks like this in macOS 10.15 (Catalina) and earlier:

macOS Installation Failed error occurred installing selected updates

Did one of the tips higher up resolve the "Installation failed, An mistake occurred while installing the selected updates." macOS fault for y'all? Did you find another solution? Share your experiences in the comments!

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Source: https://osxdaily.com/2021/01/27/fix-macos-installation-failed-an-error-occurred-while-installing-the-selected-updates-errors/

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