Windows 8 OEM key issue Key fails to activate or install Troubleshooting steps available
You can try getting a Windows 8 OEM setup from the official Microsoft website or authorized resellers.
It functioned well with an OEM key.
Thanks but I need a Windows 8 media not a Windows 8.1 Media
It seems the main concern is avoiding Windows 8.1.
You possess a Windows 8 product key, not a Windows 8.1 key.
It should function properly, give it a try.