I'm thinking of getting windows 10 pro for my new build, but the website i'm getting it from(Kinguin) only says Windows 10 OEM KEY. So I don't know if it's just a Key or if it comes with an installer. If it doesn't come with an installer than where do I get one. Here is the link: https://www.kinguin.net/category/19429/windows-10-professional-oem-key/