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Windows 10 Language Packs -
dism /online /Add-Package /PackagePath:C:\LPs\Microsoft-Windows-Client-LanguagePack-x64-ja-jp.cab Then set display language with PowerShell:
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dism /online /Add-Package /PackagePath:C:\LPs\Microsoft-Windows-Client-LanguagePack-x64-ja-jp.cab Then set display language with PowerShell: