Microsoft no longer offers a direct download for the ISO file on its official software download page , as this version reached its end of servicing on October 8, 2024 . The Official Microsoft Windows 11 Download Page currently only provides the latest stable version (e.g., 23H2 or 24H2).
Unless you are a developer archiving specific builds, Microsoft does not host it on their "top" consumer pages because it is a security hazard. Your search for a 21H2 ISO is actually a search for compatibility—and Rufus + the latest ISO solves that without the risk. download windows 11 21h2 iso file 64bit microsoft top