Error class when running Windows10Upgrade

Question

When trying to run Windows10Upgrade the following error appears "Errorclass not registered."

Answer 1

Hi @Frank De Greef

Thanks to reaching out here.

• Check your system date may be not match with current date and time.
• datetime is correct then download manually and try to install the updates.
• check you have admin rights to install updates.
• all above perfect then you have to face the same issue. call your IT engineer to resolve this issue.

Thanks.

Answer 2

Error Ox80096004-Ax20000 received when installing Media creation tool

Answer 3

Hi,

Try this alternative approach:

Download an ISO file and Run Setup.exe to Start the Upgrade, using Windows 11 Media Creation Tool.

https://go.microsoft.com/fwlink/?linkid=2156295

All the steps, including MCT and Installation Assistant, are covered here:

https://www.yourwindowsguide.com/2025/09/install-windows-11-25h2-manually-or-offline.html

I hope that helps. Keep me posted.

The above-linked blog's content is written by a Windows MVP, so it is safe. However, watch out for the ads. Additionally, It should automatically translate into the browser language as well."

Answer 4

The error "Class not registered" when running a Windows 10 upgrade is typically associated with Remote Desktop connections when the user has a mandatory profile.

In that scenario, the fix is to install the Windows 10 update KB4338817 (OS Build 16299.579) on the client. This update corrects the issue that causes the "Class not registered (0x80040154)" error.

For a system where Windows10Upgrade is being used and this error appears, ensure that all latest cumulative updates for the current Windows 10 build are installed, including KB4338817 if the system is on version 1709, and then retry the upgrade.

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References:

• Clients can't connect and get the "Class not registered" error