Microsoft Windows 10 Language Pack Offline Install -extra -

dism /online /add-package /packagepath:"path\to\languagepack.cab"

This command installs the French language pack. Microsoft Windows 10 Language Pack Offline Install -Extra

PowerShell offers a modern alternative to DISM for offline package management. 1.4.2, 1.4.3 Open PowerShell as Administrator. Run the following command to add the package: powershell dism /online /add-package /packagepath:"path\to\languagepack