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When I tried to upgrade my PC from Windows 10 Pro to Windows 11 pro using installation assistant but its shows Windows 11 installation has failed and Stuck up checking for updates 46%

Ganesan Ilamaran 40 Reputation points
2025-08-04T05:44:41.6266667+00:00

Our domain computers have with Windows 10 pro operating system, as a part of Windows 10 EOL on Oct 14 2025. We decide to upgrade the system to Windows 11.Our domain computers compatiable for Widows 11. So, when I attempted to upgrade my PC from Windows 10 Pro to Windows 11 Pro using the Windows 11 Installation Assistant, the process failed repeatedly. The installation gets stuck at "Checking for updates – 46%", and after waiting for hours, it still doesn't move forward. Eventually, it throws an error: "Windows 11 installation has failed."image.png

Windows for business | Windows Client for IT Pros | Devices and deployment | Install Windows updates, features, or roles
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  1. DaveM121 765.4K Reputation points Independent Advisor
    2025-08-04T06:19:07.4766667+00:00

    The most successful method to upgrade to Windows 11 is to use the Windows 11 ISO.

    Please ensure you download the ISO in the same language as you use for the Windows UI, follow the steps, this is then not like re-installing Windows, it is just like an update and your personal files, settings and installed software will not be affected.

    You will need at least 40GB of free space on the C drive for the upgrade.

    Click this link:

    https://www.microsoft.com/software-download/windows11

    to download the Windows 11 ISO

    When the ISO file completes downloading

    Disconnect from the Internet

    Disconnect all external devices with the exception of a mouse or keyboard.

    Temporarily disable any 3rd party Anti-virus you may have installed

    Then, in Windows File Explorer, double click the ISO and then run Setup.exe and select the Install option.

    Very Important - ensure you select the option to keep your files and apps.

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