Microsoft's free Windows 10 upgrade offer still works for many Windows 7 and 8 users. With support for Windows 7 ending in January 2020, Microsoft is encouraging users to upgrade to Windows 10 to keep devices running securely and smoothly. On Microsoft's website, the Windows 10 Home operating system costs $139 to download. However, you don't necessarily have to shell out the cash: A free upgrade offer from Microsoft that technically ended in 2016 still works. When Windows 10 was first released in July 2015, Microsoft offered an unprecedented free upgrade offer for Windows 7, 8 and 8.1 users, good...