I notice you're looking for a "Windows 9 ISO file download." However, — they skipped from Windows 8.1 directly to Windows 10.

Would you like help finding the correct official download for the actual Windows version you need?

If you see websites offering "Windows 9 ISO downloads," they are almost certainly that could contain viruses, ransomware, or unwanted software.

Never download an "Windows 9 ISO" from third-party sites. They don't exist legitimately and pose serious security risks.