According to a report by Neowin, starting on January 31 Microsoft will only offer Windows 11 licenses for purchase online. However, there will still be third-party merchants like Newegg and Amazon where you can purchase Windows 10 licenses.
Microsoft to stop selling Windows 10 licenses by the end of January
Microsoft will officially stop selling Windows 10 licenses on its website by the end of this month. This means that you will only be able to buy the OS through third-party retailers.
Microsoft to stop selling Windows 10 licenses by the end of January