Various custom-built operating systems carry the "Windows 9" name but are actually modified versions of existing systems.
: Many "Windows 9" downloads are modified Windows 8.1 builds designed to look like Windows 7. windows-9-free-download-full-version-softfiler
There are official Microsoft products with "9" in their name that are often confused with an operating system: Download .NET 9.0 (Linux, macOS, and Windows) Various custom-built operating systems carry the "Windows 9"
as a Microsoft operating system. Microsoft famously skipped the version number 9 and moved directly from Windows 8.1 to Windows 10. windows-9-free-download-full-version-softfiler