We couldn't install Windows 11 from 23H2 to 24H2

To update Windows 11, you have to fulfill some hardware requirements. If the hardware is fine, you can use the tool WhyNotWin11. It's a completely free and open source online tool for fixing "We couldn't install Windows 11" error. This tool is mainly used to check if the hardware meets the requirements of Windows 11, and it also gives detailed reasons for failed downloads. The download process can be a bit tedious, but I'll walk you through the steps to download and use it.

1. At the top of the page, find the "Release" option and click on it, then find the file WhyNotWin11.exe under "Latest Version". Click “Download” and wait for the download to complete. 

2. Once the download is complete, press the Windows key and the E key at the same time to open File Explorer and go to the Downloads folder. 

3. Double-click WhyNotWin11.exe in the folder, a security warning window will pop up, click "More Info" and then "Still Need" to run the program. 

4. After the program runs, it will automatically scan for hardware and display a list with green markings indicating that the hardware passed the test and red indicating incompatibility. Adjust the program according to the items marked in red, and if the hardware does not support it, consider upgrading the device.

5. Once all the adjustments are done, press the Windows key and the R key at the same time, type shutdown /r in the Run box that pops up, press Enter to restart your computer, and then you can run the Windows 11 installer again.

By following the steps in above, you can easily fix We couldn't install Windows 11 issue when updating from Windows 11 23H2 to 24H2.