https://betanews.com/2023/09/29/microsoft-ends-free-upgrades-from-windows-7-and-8-to-windows-11
The number of paths for upgrading to Windows 11 for free has just been reduced. Microsoft has officially removed the option to upgrade from both Windows 7 and Windows 8 to Windows 11 without paying.

This should not really come as a surprise, as the ability to upgrade from Windows 7 and 8 to Windows 10 and then 11 free of charge is not something that was meant to last. Microsoft originally said that these upgrade routes would remain available until mid-2016, but the company either "forgot" to disable the option or decided to leave it open to get as many people onto its newer operating systems as possible. But now this changes as explained in a sneakily quiet announcement by Microsoft.