at the WinHEC conference in China , Microsoft announced new details for Windows 10, including free upgrades to all Windows Pirates and how Windows and devices upgrade to Windows 10 for a variety of versions. Not surprisingly, Microsoft will provide two ways to upgrade users to Windows 10 through ISO and Windows updates. In general, if you are running the latest version of Windows 7 or Windows 8, users can choose either of the two upgrade modes to upgrade to Windows 10. If the user's current operating system is a version of all other iterations of Windows 8 and 7, then only ISO can be used to upgrade.
Windows Phone 8.1 will be able to upgrade to Windows 10 mobile OS for users who use Windows phones, but if the phone is still running Windows Phone 8, upgrade to Windows Phone 8.1 In order to continue upgrading to the Windows 10 Mobile version. Windows RT has not upgraded Windows 10, and Microsoft has previously said that there will be some kind of Windows 10 corresponding to the Windows RT device upgrade, but now according to Microsoft's latest Windows 10 upgrade roadmap, Windows The RT platform will not be able to run any form of Windows 10.
If you are running Vista or XP, you need ISO to clean the Windows 10 installation.