OfficeSetup.exe /configure configuration.xml
Or for fully silent (no UI):
OfficeSetup.exe /configure silent-config.xml /quiet /norestart
An offline installer (also known as a full standalone installer) is a single executable file (.exe) or a folder of setup files that contains the entire Microsoft Office suite. Unlike the web installer (a 5MB launcher that downloads the rest during setup), the offline installer holds all the bits for Word, Excel, PowerPoint, Outlook, and more. offline installer office
The key difference:
Law firms, medical offices, and government contractors often have computers that never touch the public internet. The offline installer is the only way to get Office onto those machines. OfficeSetup
Here is the catch: While the binaries install offline, activation typically requires a one-time internet connection. However, there are exceptions: Or for fully silent (no UI): OfficeSetup
For home users: Connect the laptop to your phone's hotspot for 30 seconds, activate Office, then disconnect. It will remain activated for months offline.