Upgrade prompt during unattended install

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Octopuss

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• Oct 16, 2025

• #1

I am trying to move my unattended installation over to Win 11 and have run into an obstacle - I keep getting this prompt right after booting from an image:


Does anyone know how can I bypass that? I presume it could be something to configure in the autounattended.xml file, but I have no damn idea, and I couldn't google up anything either.

 

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garlin

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• Oct 16, 2025

• #2

To prevent this message, you have two options:

1. Switch to the legacy Setup client.
   Problems with 24H2 autounattend install with config set
   
   
2. Use a <DiskConfiguration> which wipes the disk, using <WillWipeDisk>true</WillWipeDisk>
   24H2/25H2 Setup is detecting you have specific Windows temp folders leftover from a canceled clean install, or from an in-place upgrade.

 

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Octopuss

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• Oct 16, 2025

• #3

What's legacy setup client? I have never heard about that.

<WillWipeDisk>true</WillWipeDisk> is what I've been using for ten years across all Windows versions, so that's obviously not helping

 

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garlin

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• Oct 16, 2025

• #4

If you've been using unattended mode for 10 years, legacy Setup is what you're used to. 24H2/25H2 defaults to a new Setup client.

 

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Octopuss

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• Oct 16, 2025

• #5

What do you mean? It looks exactly the same

 

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garlin

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• Oct 16, 2025

• #6

Have you tried running a clean 24H2/25H2 install without the unattended file?

 

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Octopuss

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• Oct 16, 2025

• #7

Oh. I don' think so. Let me see.

...
Hm, it looks exactly the same. I run it in a VM.

 

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garlin

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• Oct 16, 2025

• #8

Totally the same Setup...

 

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pseymour

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• Oct 16, 2025

• #9

Octopuss said:

Oh. I don' think so. Let me see.

...
Hm, it looks exactly the same. I run it in a VM.

Click to expand...

That's the new setup. Screenshot below shows new setup on the left, classic setup on the right.


View attachment 149308

 

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