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

It quit again but then I was able to get it to resume the download almost immediately . . .
Screen Shot 2020-11-12 at 5.14.42 PM.png
 
Skb3735 said:
This seems to be due to an interrupted or corrupted download. This can usually be resolved by clearing your Mac App Store cache.

  1. Quit the Mac App Store
  2. Go to Terminal and type following: open $TMPDIR../C/com.apple.appstore/
  3. Move the files inside the folder to the Desktop or any temporary location (if you are confident, you can move them to Trash straight away.)
this worked for me. downloading again now
Click to expand...
It worked for me, too.
 
Don't want to jinx it but my progress bar is steadily moving now...not just hanging at a low number of GB. Its slow, but steady for the moment.
 
How do I download the installer package from App store? Whenever I click on GET it goes to the update control panel and gives the same "Instllation failed" error msg. Any fixes yet? :( Thanks!
 
I'm getting closer...a few GB at a time...then the error message....and

SUCCESS.

Wow. Smooth rollout Apple. :-/
 
poormatt said:
I got that too. Updated Safari and after it installed, I was able to kick off the Big Sur download.
Click to expand...
Same here. Maybe it cleared something since Big Sur just finished downloading. Except now it gave me an error message right at the end and says that my Mac is up to date with Catalina 10.15.7. :mad:
 
Just started working in the last few minutes. Been trying all day, clearing cached files, rebooting in safe mode, etc (you know, just in case something was borked on my end on top of things being borked on their end). Just in the time typing this it's downloaded another 10%, so it's moving pretty quickly now.
 
Took me 4 separate attempts (failing in-between and starting again) but I finally downloaded all 12 GB of this thing and now I'm installing. Ughh lol
 
I'm in North Georgia up by Tennessee. I'm still getting the error message. If I keep hitting OK and then try to download, it'll work for a bit, hang at about 3gb, and then crash again. The closest I've gotten was the full 12.1 gb, and then it crashed.
 
I figured out a way to do it if you completed the download beforehand and had the issue that everyone was posting about.

You need to delete the automatic update which is located at /Library/Updates

It will be a folder beginning with a three digit number.

The docs in this folder are protected by SIP so you have to turn that off. Do that by restarting the computer and booting into Recovery Mode by holding Command + R. Then open the Terminal and type "csrutil disable" without the quotation marks. Then restart the computer.

Delete the file by navigating to /Library/Updates and deleting the folder or typing "sudo rm -R /Library/Updates/0##-#####" into Terminal without the quotation marks and using the folder name.

Open software update and attempt to download the update. If it still shows the error message, quit software update (I just used Command + Q) and reopen it. It then allowed me to download the new update.

After you get the new OS up and running you may have to re-enable SIP. Do this by once again booting into Recovery Mode but then typing "csrutil enable" without the quotes. Restart and boot as normal and you're golden!
 
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