How to fix 'Windows 11 installation has failed' issue?

I recommend SetupDiag, a free diagnostic tool provided by Microsoft, which needs to be downloaded from the official website and is completely free. It is used to analyze the logs of failed Windows 11 installations to find out the exact cause of the error .It is highly specialized and suitable for users with a certain technical base. After running to generate a detailed report without a graphical interface, command line operation, the first use may be slightly complicated to analyze the logs about 1-5 minutes, depending on the size of the logs, but do not worry I will tell you how to solve Windows 11 installation has failed problem with this free app!

1.Visit Microsoft's official website.

2. Download the latest version of SetupDiag.exe and save the file to your desktop or other easy-to-find location.

3. Press Windows + S, search for cmd, right-click and select Run as administrator.

4. At the command prompt, type cd C:\Users\YourUsername\Desktop

Press Enter and the command line will display the new path.

5. Type SetupDiag.exe and press Enter the tool will automatically scan the installation log, the process will take about 1-5 minutes.

6. After completion, the desktop will generate a SetupDiagResults.log file Double-click to open the file
Find Error or Failure section, record the error code

7. Copy the error code to your browser and search for it like this Windows 11 0xC1900101

8. Fix the problem according to Microsoft's documentation or forum suggestions and then restart your computer and re-run the Windows 11 installer.

This is a quite effect way to fix Windows 11 installation has failed error during install!