Hi Pepe,
Please open CMD as administrator and run the command Dism /online /Add-Package /PackagePath:"<FilePath>\<PackageName>.cab"
to add FODs. For example:
Dism /online /Add-Package /PackagePath:"C:\users\Administrator\Desktop\Microsoft-Windows-LanguageFeatures-Basic-zh-cn-Package~31bf3856ad364e35~amd64~~.cab"
Use your own file path and the cab package you downloaded. The Language and Optional Features ISO can be downloaded here.
https://learn.microsoft.com/en-us/azure/virtual-desktop/windows-11-language-packs
Refer to this link for more details
Best Regards,
Ian Xue
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