If you plan to use one of the available installation tools, the Windows 11 setup may stop unexpectedly with the error code 0x8007042B 0x4000D or 0x800700B7 0x2000A, which could indicate that another process is conflicting with the upgrade.

You can close the process in question and restart the setup to resolve the issue. Using a clean boot to restart the setup or remove the app causing the problem could help continue the installation.

Terminate process in Task Manager

To terminate a process or application with Task Manager, use these steps:

1. Open Start.
2. Search for Task Manager and click the top result to open the app.
3. Click the More details button.
4. Select the app or process.
5. Click the End task button.

   Source: Windows Central

6. Repeat steps No. 3 and 4 to terminate the remaining apps.

After you complete the steps, restart the setup and continue with the Windows 11 installation.

Uninstall a Windows app

To remove an app on Windows 10, use these steps:

1. Open Settings.
2. Click on Apps.
3. Click on Apps & features.
4. Select the app.
5. Click the Uninstall button.

   Source: Windows Central

6. Click the Uninstall button again.
7. Continue with the on-screen directions (if applicable).

Once you complete the steps, the upgrade process should finish successfully.