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Hi Bob, I've never done much with DISM, so I can I can only tell you what I suspect would be the case. I don't think that the 2004 DISM will work with the 20H2 ISO. However, it will definitely work with the 2004 ISO. Now 21H1 is about to be released, and I think that could trigger another forced upgrade for old releases. If I remember right, these releases have a life span of 1.5 years, meaning, you can only use 2004 for another couple of months before the next forced upgrade is due. Therefore, it could be better to upgrade straight to 20H2, which will last 6 more months until early 2022. Let me answer both your post in one reply since they're connected. You don't need an active internet connection to do a repair upgrade. Just make sure the connection is offline before you start setup. In my experience, repair upgrades fix almost any issue with the Windows installation. And it's not over yet. After two years, my lawyer has finally made some progress on my data subject request, so let's wait and see what personal data Amazon has collected about me over the years. That's not a bug. The two files seem identical but have different product IDs, so I decided to keep both in the list, in case one of them should disappear without prior announcement from Microsoft.