SteamOS! it’s (sort of) here! I’m a little bit late getting this guide out but better late than never! Right? Anyway before I get stuck into this I am going to be assuming a couple of basic things: You already knows how to use VirtualBox, or are sufficiently familiar with virtualization to work it out. You know how to create an ISO file with something like IsoCreator. You have downloaded SteamOSInstaller.