The Windows 11 version 21H2 update history on Microsoft Support catalogs every build from the initial launch through its end of service.
Are you trying to that shows "2105," or
The original launch version of Windows 11, released in October 2021. Search results for Windows 11 (2105)
Some early leaked builds of Windows 11 had different internal identifiers, but the standard naming convention follows the YYHx format (e.g., 21H2, 22H2). The Windows 11 version 21H2 update history on
If you are looking for information on early versions of Windows 11, the following articles provide the most relevant historical and technical context: Essential Articles for Early Windows 11 Search results for Windows 11 (2105)