A .dmg file is a Mac disk image typically used as an installer. For Office LTSC 2021, installation often involves two main components:
Build 16.66 (specifically 16.66.22100900 ) was released as part of the standard update cycle for Office 2019 and Office LTSC 2021 for Mac. Microsoft Office 2021 pro Mac LTSC 16.66 .dmg
alsyundawy/Microsoft-Office-For-MacOS: Installer ... - GitHub Microsoft Office 2021 pro Mac LTSC 16.66 .dmg