I think you’re right. 6.22 looks correct now that I see it written down. It came as a package with Windows 3.1 or maybe Windows 95, on a separate set of disks.
Bingo! It was packaged with Windows 3.1 and Windows for Workgroups 3.11. You installed the MS-DOS first, then Windows second. It was the last time we would ever see DOS all by itself.