Downloading the 21H2 ISO is akin to buying a classic car off the lot. It is the "Vanilla" experience.
While Microsoft typically prioritizes the most recent version (such as 23H2 or 24H2) on its main download pages, you can still obtain the 21H2 disk image through several official and reliable methods: Windows 11 Home and Pro - Microsoft Lifecycle windows 11 21h2 iso download
Insert the USB drive or mount the ISO file, and follow the installation prompts to install Windows 11 21H2. Downloading the 21H2 ISO is akin to buying