Several "Windows 9" files available on platforms like the Internet Archive are actually community-made modifications (mods):

: Some enthusiasts created "concepts" of what Windows 9 might have looked like, packaging them as installable ISOs. 2. Leaked Technical Previews

Early in the development of Windows 10, some internal builds were referred to as "Threshold." Some of these leaked builds (like Build 9834) are occasionally labeled as Windows 9 Technical Previews in archive collections, even though they were early versions of what became Windows 10. 3. Potential Security Risks

: These systems will not receive security updates from Microsoft, making them highly vulnerable to modern threats. Recommendation

If you find a download for a "Windows 9 ISO version complète," it is almost certainly one of the following: 1. Unofficial Community Modifications

For a secure and supported experience, you should download official ISOs directly from Microsoft's Software Download page : Download Windows 11 - Microsoft

Be extremely cautious with sites like "Softfiler" or third-party download blogs offering "complete versions" of non-existent software.