Windows 8.1 Language Pack Offline Install Page

dism /Mount-Wim /WimFile:C:\win8.1\install.wim /Index:1 /MountDir:C:\mount dism /Image:C:\mount /Add-Package /PackagePath:D:\lp.cab dism /Commit-Wim /Unmount-Wim /MountDir:C:\mount Then reinstall Windows using that modified image – the language will be pre-installed. If you have internet even temporarily, use the built-in “Add a language” via Settings → Change PC settings → Time and language → Region and language. It automatically downloads everything needed. Use the offline method only when truly necessary.