UPDATED : Windows 8.1 support ended on January 10, 2023, which means you should upgrade to Windows 10 as soon as possible.
Although files and apps will be preserved, you still want to create a backup of your computer.Yes, you can still upgrade for free since the Windows 8.1 product key will activate Windows 10.
To upgrade from Windows 8.1 to Windows 10, open Media Creation Tool, select “Upgrade this PC now,” and click Install.