If you find a download for a "Windows 9 ISO version complète," it is almost certainly one of the following: 1. Unofficial Community Modifications
Be extremely cautious with sites like "Softfiler" or third-party download blogs offering "complete versions" of non-existent software.
For a secure and supported experience, you should download official ISOs directly from Microsoft's Software Download page : Download Windows 11 - Microsoft
: Some enthusiasts created "concepts" of what Windows 9 might have looked like, packaging them as installable ISOs. 2. Leaked Technical Previews
: These ISOs are not official and can contain embedded malware, keyloggers, or backdoors.
Several "Windows 9" files available on platforms like the Internet Archive are actually community-made modifications (mods):