Microsoft will stop selling Windows 10 licenses in its online store starting February 1, 2023. The corresponding message appeared on the product pages for Windows 10 Home, Professional and Workstation in the US:
January 31, 2023 will be the last day this download version of Windows 10 will be available for purchase. Windows 10 will continue to be supported with security updates to help protect your PC from viruses, spyware, and other malware through October 14, 2025.
Therefore, after this deadline, Microsoft will only sell Windows 11 licenses. Of course, you will still be able to purchase Windows 10 from third-party retailers, including physical copies.