The question about upgrade to Windows 10 from Windows 7 or 8.1 employs many users who buy an new Computer or an new Notebook, before the appearance of Windows 10.
Microsoft made it provided for one year to carry out a free upgrade to Windows 10. This will be possible with all PC and mobile phones that are running with installed Windows 7, Windows 8.1 or Windows Phone 8.1 .
Excludes RT and Windows Enterprise, or volume licenses!
Microsoft will not stop even the operating system is illegal to upgrade to the new Windows 10. However, the use of this remains illegal.
For a year after appearance of Windows 10 ( 29 Jun 2015 - 29 Jun.2016)
See also: Upgrade Windows 7 or 8.1 to Windows 10 || Downgrade Windows 10 / Uninstall || Auto-Login Win 10
FAQ 12: Updated on: September 17th 2015 10:48