macOS Big Sur Installation Failed: 'An Error Occurred While Installing the Selected Updates' - MacRumors
Skip to Content

macOS Big Sur Installation Failed: 'An Error Occurred While Installing the Selected Updates'

Apple this morning released macOS Big Sur to the public, and since the software went live, it has had extremely long download times that have prevented many from being able to install it.

macos software update issue
Even those who have made progress through the download have run into problems where the software downloading process is suddenly interrupted and must be restarted. Others have reported being able to download the update and then having the installation fail. Apple's site appears to be having some major issues due to the number of people attempting to download the update at once.

In addition to these Big Sur download problems, Apple's developer site is also down at this time, and as a result, some third-party apps are unable to be opened up at this time.

an error occured screenshot

An error occurred while installing the selected updates

It's not clear what's causing the problem. It could be that the macOS Big Sur downloads are failing due to a developer site issue or the developer site could be failing under the strain of macOS Big Sur demand, but it is clear that those hoping to get the new software should hold off until things are more stable.

Apple's System Status page is listing an issue with macOS Software Updates and says that the problem is "currently being investigated."

Related Forum: macOS Big Sur

Popular Stories

iOS 26

iOS 26.5 Features: Everything New in iOS 26.5

Monday May 11, 2026 5:09 pm PDT by
Apple released iOS 26.5 after a few months of beta testing, and while it doesn't have the Siri features we were hoping for since those are being held until iOS 27, there are a handful of useful changes worth knowing about. Subscribe to the MacRumors YouTube channel for more videos. End-to-End Encryption for RCS Support for end-to-end encryption (E2EE) for RCS messages between iPhone and...
Dynamic Island iPhone 18 Pro Feature

11 Reasons to Wait for the iPhone 18 Pro

Monday May 11, 2026 9:01 am PDT by
We're only four months out from the launch of Apple's premium next-generation smartphone lineup, and while we're not expecting a sea change in terms of functionality, there are still several enhancements rumored to be coming to the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth noting is that Apple is reportedly planning a major change to its iPhone release cycle this year, adopting a...
Four iPhone 18 Pro Colors Mock Feature

iPhone 18 Pro May Have 'Aggressive' Starting Price Despite RAM Crisis

Tuesday May 12, 2026 6:53 am PDT by
While the ongoing RAM chip shortage is leading some Android smartphone makers to increase prices, one analyst believes that Apple will take advantage of the situation with the upcoming iPhone 18 Pro and iPhone 18 Pro Max. In a research note with GF Securities today, analyst Jeff Pu said he expects Apple to outperform in the smartphone market by having an "aggressive pricing strategy" for the ...

Top Rated Comments

ActionJacksonHern Avatar
72 months ago
Who else is seeing this?


Attachment Image
Score: 64 Votes (Like | Disagree)
72 months ago
Guys, please keep posting screenshots of the same error message, it's really interesting and helping.
Score: 59 Votes (Like | Disagree)
72 months ago


Attachment Image
Score: 36 Votes (Like | Disagree)
budfoot Avatar
72 months ago
Apple just DOS'd every single mac for almost 10 minutes. This is the bigger issue. I shouldn't have to check-in to an Apple server every time i want to launch Microsoft Word.

How is this OK?

(no, i didn't have a failed install)
Score: 20 Votes (Like | Disagree)
ghostface147 Avatar
72 months ago
My machine can no longer run any 3rd party programs after a restart after several installation failed notices during download.
Score: 19 Votes (Like | Disagree)
72 months ago
Pathetic.

Netflix, etc, can handle the load when a new movie or TV series is dropped. You'd think Apple would've figured this out by now.
Score: 15 Votes (Like | Disagree)