Offline language packs cannot be downloaded via the standard Settings app. They must be sourced from Microsoft repositories.
The specific for adding a language to a live machine? windows 10 22h2 language pack download offline
DISM /online /Add-ProvisionedAppxPackage /PackagePath:D:\LangPacks_22H2\localexperiencepacks\x64\Microsoft.LanguageExperiencePackja-JP_*.appx /LicensePath:D:\LangPacks_22H2\localexperiencepacks\x64\Microsoft.LanguageExperiencePackja-JP_*.xml Offline language packs cannot be downloaded via the
Offline language packs cannot be downloaded via the standard Settings app. They must be sourced from Microsoft repositories.
The specific for adding a language to a live machine?
DISM /online /Add-ProvisionedAppxPackage /PackagePath:D:\LangPacks_22H2\localexperiencepacks\x64\Microsoft.LanguageExperiencePackja-JP_*.appx /LicensePath:D:\LangPacks_22H2\localexperiencepacks\x64\Microsoft.LanguageExperiencePackja-JP_*.xml