Downloading and installing additional languages for windows allows menus, dialogue boxes and other interface items in your preferred languages. Language packs are packages that when installed into a Windows installation bring supportfor a new language on your system. 4 How to Install the Windows 10 Language Pack? What are language packs and what do they do?.3 Windows 10 Language Pack Direct Download Links.2 Categories of Windows 10 Language Pack.1 What are language packs and what do they do?.