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Alternatively, extract the language pack from a Windows 8.1 (search for mu_windows_8.1_language_pack.iso ).
dism /online /add-package /packagepath:C:\LanguagePack\lp.cab windows 8.1 language pack offline install
Replace C:\LanguagePack\lp.cab with the actual path to your language pack file. Alternatively, extract the language pack from a Windows 8
Copy your language pack file to a simple path, like C:\lp.cab . windows 8.1 language pack offline install
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.