Microsoft has just released the official Windows 8.1 Preview download link, so users who want to create a dual-boot are advised to get this feature.
As you may know, Windows 8.1 Preview is available as a free update for Windows 8 users, with the main package available through the Windows Store.
And yet, since 8.1 is just a preview, Microsoft will also offer update as stand-alone ISO, which will be more practical if you want to deploy the operating system in a different partition and use it with a setting double boot parameters.
Of course, most users are advised to get Windows 8.1 Preview through the Windows Store, as this is the safest, fastest, and easiest way to develop the update either for desktops or for tablets.
Users must first download this little piece , restart their device. Only in this way can their device then proceed with the actual installation of Windows 8.1 Preview.
ISO files are not yet available.