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

D

dmelgar

macrumors 68000
Apr 29, 2005
1,587
160
Apple status page reports

macOS Software Update - Resolved Issue​

Today, 1:00 PM - 4:15 PM
Some users were affected
Users may not have been able to download macOS Software Updates on Mac computers.
Click to expand...
However, any attempt to install still fails.
Installation failed
An error occurred while installing the
selected updates.
Click to expand...
 
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Bemewsed

Bemewsed

macrumors newbie
Nov 12, 2020
1
0
I have a slightly different error; any sage advice?
Screen Shot 2020-11-12 at 3.43.41 PM.png
 
L

LewisAllen23

macrumors newbie
Nov 12, 2020
14
8
Just read on a blog this - don't know whether to trust or not:

'Open Terminal and Type

curl http://17.253.55.201/content/downlo...x1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com” -o InstallAssistant.pkg


Basically the Software Update wants to download InstallAssistant.pkg from Apple CDN, but probably their CDN network has problems. So I’ve tried all the Apple CDN IPs and get one server working – 17.253.55.201

All CDN IPs are:

– 17.253.55.209
– 17.253.57.202
– 17.253.57.205
– 17.253.55.201
– 17.253.57.203
– 17.253.57.207
– 17.253.55.205
– 17.253.57.201
– 17.253.57.209
– 17.253.55.202'
 
HAFENCITY

HAFENCITY

macrumors newbie
Nov 12, 2020
3
0
Downloaded the mentioned Link (TWITTER). Ready to go ...
 

Attachments

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Harmush

Harmush

macrumors 6502a
Sep 21, 2008
557
3
Liverpool
Bandaman said:
How do you know this?
Click to expand...
It doesn't look like an apple server! I aint going to risk it, but...

I downloaded it on a sandbox machine and it's signed by the Apple Root CA... might be okay... someone else try it and let me know? :cool:

Screenshot 2020-11-13 at 00.02.54.png

MD5(InstallAssistant.pkg)= 0030d26c6e5d01b7aa10a91b044d6ca7
SHA256(InstallAssistant.pkg)= ae026c7cc877689749f4ed9b516f77db2248b81888ca862bf9031105f2bc813d
 
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C

colinwil

macrumors 6502
Nov 15, 2010
296
167
Reading, UK
AppleMad98004 said:
Yup one machine I jumped on earlier and after a few hours completed the download won't install or re-download. Another I waited until Apple Support showed issue resolved and it works. Installing. Early adopters got hosed.
Click to expand...
Since reading your message I tried updating my third & final mac - my Mac Mini, from Software Update in System Preferences

That's giving exactly the same 'Installation Failed' error as my iMac and my MacBook Pro - even though I hadn't previously tried to update it.

So if its working for you then either it's an intermittent issue and you're lucky :) Or it could be a regional thing (?) I'm in the UK...
 
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Blowback

Blowback

macrumors 65816
Jan 10, 2018
1,301
735
VA
AppleMad98004 said:
Yup one machine I jumped on earlier and after a few hours completed the download won't install or re-download. Another I waited until Apple Support showed issue resolved and it works. Installing. Early adopters got hosed.
Click to expand...
Can you confirm this outside of your experience ?
 
SuperMatt

SuperMatt

Suspended
Mar 28, 2002
1,569
8,281
I got it downloaded almost immediately after it was up on the internet... but then like many people, I get the “installation failed” message, and if I try again, it doesn’t need to download again since it’s downloaded, but it just returns that same “installation failed” message right away.
 
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