If you are looking to buy a key today, you must be extremely cautious.
The restrictions on language and the total lack of security updates make it a liability. windows 8.1 single language key
If you have a valid Single Language key and want to reinstall Windows, you face a hurdle: Microsoft removed the official ISO downloads for Windows 8.1. Even if you find an ISO, you must find the specific language version of that ISO, or the key will be rejected during installation. If you are looking to buy a key