Thank you for sharing the screenshots.
Open the Command Prompt administrator window.
Run the command below, then click Enter.
Sfc /scannow
Once done, restart your PC and run the Media Creation Tool.
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If you are still having issues,
Click Windows + R key, type regedit.exe, and click ok.
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e965-e325-11ce-bfc1-08002be10318}
Delete the 'lower filters' and 'upper filters' values on the right side and exit the registry.
Restart your computer and mount the ISO file.
Disclaimer: Generally, modifying registry subkeys or work group is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For further protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click How to back up and restore the registry in Windows - Microsoft Support to view the article.