You can still upgrade to Windows 10 today, though it will cost you between $139 to $199.99 for the product key. All you had to do was click the Get Windows 10 icon and follow the on-screen instructions from there. When Windows 10 was launched, Microsoft offered free upgrades until July 29, 2016. This means that Windows 10 has finally replaced Windows 7 as the most popular Windows operating system. According to a 2018 report by an analyst firm, Windows 10 has overtaken Windows 7 in terms of overall market share, with the former claiming 42.78% of the PC market and the latter dropping down to 41.86%. Ever since Windows 10 was released in July 2015, a lot of Windows users have upgraded to the new operating system.