If you receive an "Only one language pack allowed" or "Your Windows license supports only one display language" message, you have a single language edition of Windows 10. Here's how to check your Windows 10 language edition:
-
Select Start > Settings > About, and then scroll down to the Windows specification section.
-
If you see Windows 10 Home Single Language next to Edition, you have a single language edition of Window 10, and you can't add a new language unless you purchase an upgrade to either Windows 10 Home or Windows 10 Pro.