Hi all,
Back in the El Capitan days, I could download a "Install OS X El Capitan 10.11.6 installESD.dmg" file, upload it to Casper, and end-users can select it within Self Service to upgrade their operating system on their Macbooks.
I am trying to find a "Install macOS Sierra 10.12.2 installESD.dmg", but I can't find it anywhere. I remember it used to be in https://developer.apple.com/download
Does anyone know where the Sierra dmg would be? Or know how I can create one?
The one I download from App Store would only be an app file. I don't know if this would work.