Windows 121 Iso File Link < UPDATED ◆ >
Another angle: Maybe the user is looking for a specific build number, like a developer preview or an insider build. For example, Windows 11 22H2 is build 19045, but not 121. Wait, build numbers can be misleading. I should check the actual build versions. For example, Windows 10 April 2018 update is 17134, and Windows 11 22H2 is 22621. So "121" doesn't match any standard build number. So the user might have mixed up version and build numbers.