https://eclecticlight.co/2020/12/17/apple-has-stopped-providing-standalone-installers-for-macos-updates/

Apple has stopped providing standalone installers for macOS updates

Apple released macOS Big Sur 11.1 on 14 December. Although yesterday it finally posted standalone installers for the two concomitant security updates to Catalina and Mojave, no standalone updaters for Big Sur have appeared yet. Neither has it made available a standalone updater for macOS 11.0.1, which was released over a month ago.

If you feel that you “have a need for individual downloads for Big Sur delta/combo updaters”, please let Apple know. In the strongest possible terms, via Feedback, Apple Support and any other means available.

Unless a strong case is made for the reinstatement of standalone installer versions of Big Sur updates, it’s most likely that none will be provided for download – as has already happened with the 11.0.1 and 11.1 updates.

meer ...

Discussie op HN.

Het loopt nog niet helemaal soepel met de Big Sur updates.

https://arstechnica.com/gadgets/2020/12/some-big-sur-users-are-unable-to-update-macos-due-to-an-mdm-bug/

Can I just download the 11.1 update manually?

One seemingly obvious workaround would be to just directly download and manually apply the update package for Big Sur 11.1. Unfortunately, Apple has deprecated combo update packages—there is no manual package to download or install.

As of macOS Big Sur, the format of the updates has changed—and they can no longer be installed without Internet access. Update packages must come directly from Apple, and they must be managed by the softwareupdate process itself. It isn't even possible to use a custom URL for softwareupdate anymore.

Gerelateerd:

Open a terminal and use the following two commands:

Code:
imac:~ burne$ softwareupdate --list-full-installers
Finding available software
Software Update found the following full installers:
* Title: macOS Big Sur, Version: 11.1, Size: 12202442268K
* Title: macOS Catalina, Version: 10.15.7, Size: 8248985973K
* Title: macOS Catalina, Version: 10.15.7, Size: 8248854894K
* Title: macOS Catalina, Version: 10.15.6, Size: 8248781171K
* Title: macOS Mojave, Version: 10.14.6, Size: 6038419486K
* Title: macOS High Sierra, Version: 10.13.6, Size: 5221689433K


Code:
imac:~ burne$ softwareupdate --fetch-full-installer "macOS Big Sur, Version: 11.1"
Scanning for  installer
Installing: 4.0%
(I pressed ctrl-C at this point, I have no need for this download..)

Zie ook:
How to Download Full MacOS Installers from Command Line
https://osxdaily.com/2020/04/13/how-download-full-macos-installer-terminal/