Microsoft stopped selling Windows 10 back in January of this year. If you buy a new Windows license or a new computer now, you will basically get the successor Windows 11.
Until then, security updates will only be available for computers with the latest version Windows 10 22H2 from October 2022. Because Windows 11 can no longer be installed even on technically fit PCs, the experts complain about an "upgrade scandal". The technology magazine c't now complains that Microsoft is effectively declaring all devices with technology from before 11 "electronic waste"