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(Optional) Set the default user interface language for the initial boot: dism /image:C:\Mount\Image /Set-UILang:fr-FR Use code with caution. Finally, save your changes and unmount the image: dism /Unmount-Image /MountDir:C:\Mount\Image /Commit Use code with caution.

Navigate to Time & Language > Language & Region .

While the ISO is "multi-language capable," you may be asked to choose a primary language for the download itself.