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Apple has had an ongoing issue with updating through the Apple store on older OS versions that sounds very similar. It can be a quarantine issue. I had to download third party apps to get around it.
 
getting error while trying to update to Mac OS
 

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Looked in Console, filter by errors and faults whilst hitting the update now button and it'll be in there.
I get errors like this instead (and no I am not a standard user):

Fatal: interaction not allowed (kAuthorizationFlagInteractionAllowed not set) (engine 1137)

Sandbox denied authorizing right 'system.install.app-store-software.standard-user' by client '/System/Library/CoreServices/Software Update.app/Contents/Resources/softwareupdated' [662] (engine 1139)
 
Out of curiosity, some members mentioned that the issue what due to an issue with Akamai : how did they figure this out ? Can't find this in my logs.
Run Console, select 'Log Reports' and open install.log & scroll down to the most recent entries. You'll see things like:


2020-11-12 23:25:17+00 Colins-iMac com.apple.preferences.softwareupdate.remoteservice[1187]: SUOSUShimController: Install finished with error: Error Domain=PKDownloadError Code=8 "(null)" UserInfo={NSUnderlyingError=0x600002954de0 {Error Domain=NSURLErrorDomain Code=-1102 "(null)" UserInfo={NSErrorFailingURLStringKey=http://swcdn.apple.com/content/down...x1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg, PKURLTransportErrorStatusCodeKey=403, PKURLTransportErrorResponseHeadersKey={
Connection = "keep-alive";
"Content-Length" = 406;
"Content-Type" = "text/html";
Date = "Thu, 12 Nov 2020 23:25:17 GMT";
Expires = "Thu, 12 Nov 2020 23:25:17 GMT";
"Mime-Version" = "1.0";
Server = AkamaiGHost;
"X-Cache" = "TCP_DENIED from a62-253-3-166.deploy.akamaitechnologies.com (AkamaiGHost/10.2.0.2-31441410) (-)";

To my untutored eye its not clear if a62-253-3-166.deploy.akamaitechnologies.com is the problem - or swcdn.apple.com
 
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I am a little sceptic about this observation. I have never seen Apple using Akamai for software updates. Apple definitely uses their own IPv4 address space (17.0.0.0/8) for software updates and I am not aware that Akamai offers BYOIP.
Well, unless I'm reading it wrong you can see it pull from Akamai CDN in the logs, at least in some capacity...

"TCP_DENIED from a62-252-168-238.deploy.akamaitechnologies.com (AkamaiGHost/10.2.0.2-31441410) (-)";
 
Hackintosh users will steal it and that will cause issues for you with iMessage, Facetime, etc... that are tied to hardware.
Why would these apps be linked to hardware? Surely it’s your Apple ID that is the key element in how they work?
 
Wanted to give Big Sur a try on my fiancé’s Mac. Reminded me of why I left macOS for iPadOS years ago. iPadOS isn’t perfect by any means, but they completely botched this release. Hopefully the OS itself is much better, holding out hope.
 
I just noticed this in my system.log ...
Nov 12 17:33:20 macbook-pro com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.pid.SoftwareUpdateC.3611): Failed to bootstrap path: path = /System/Library/CoreServices/Software Update.app/Contents/Resources/SoftwareUpdateConfigData, error = 2: No such file or directory
 
I am a little sceptic about this observation. I have never seen Apple using Akamai for software updates. Apple definitely uses their own IPv4 address space (17.0.0.0/8) for software updates and I am not aware that Akamai offers BYOIP.
agreed. Could not find any hint of Akamai in the logs.
 
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