If you tell me which Office version and architecture you have (e.g., Microsoft 365 Apps 64-bit, Office 2019 32-bit), I can produce the exact configuration.xml and command lines for an offline install.
Administrators can use the ODT to download the necessary language files to a local network share and then install them on client machines offline. microsoft office language pack offline installer work
Once downloaded, the package can be installed on any computer without an internet connection. If you tell me which Office version and
You can’t just "add" a language within the app if you're truly offline. You first need to download the while you have a connection: You can’t just "add" a language within the
After the installer finishes, you must enable the language within the apps: Install the Language Accessory Packs for Office 2016
to pre-download the language files on an internet-connected machine before moving them to the offline target. Method: Using the Office Deployment Tool (ODT)
Some, but not all, language packs are free for Office 365 subscribers. Summary Table Online Installer Offline Installer (ODT) Internet Required Yes (constant) Only for initial download Speed Depends on connection Very fast (local network) Best For Single users, fast internet IT, corporate, no internet Complexity