Since Microsoft typically only provides the latest build (22H2), you can use the following methods to fetch the specific version directly from Microsoft's servers:
: Only the LTSC 2021 (Long-Term Servicing Channel) version remains supported for mainstream use until January 12, 2027 . System Requirements (32-bit)
Be aware that most editions of Windows 10 Version 21H2 have reached their . Home & Pro Editions : Support ended on June 13, 2023 .
Download the "Create download package" and run the included batch file as an administrator to build the ISO.