[wfhordie]

Does Apple offer “offline” versions of their updates in DMG form?

[samtheprogram]

Since High Sierra (released 2017), their documentation points to the App Store installer links instead of to DMGs [1]. It’s still possible to create a DMG installer for newer versions using createinstallmedia on the command line after downloading the installer to a Mac.

[1]: https://support.apple.com/en-us/HT211683

[my123]

> Does Apple offer “offline” versions of their updates in DMG form?

.app bundles, but only full updates not deltas.

When using Reduced Security instead of Full Security, online verification through TSS isn't necessary to install/update an OS.

[novok]

You still need activation / authorization from apple of your device when doing a clean wipe.