dism /online /add-package /packagepath:C:\LangPacks\fr-fr.cab Alternatively, using lpksetup (legacy method):
lpksetup /i /p C:\LangPacks\fr-fr.cab After installation: windows server 2016 language pack download
dism /online /set-edition:ServerStandard /set-lang:fr-fr (Replace ServerStandard with your actual edition, e.g., ServerDatacenter ) dism /online /add-package /packagepath:C:\LangPacks\fr-fr