"Windows 9 Ultimate" is not a legitimate Microsoft product. Files bearing this name are community-made mods or leaked alpha builds. Users seeking to download them are likely downloading a potentially hazardous version of a 10-year-old pre-release Windows 10 build.
Usually based on pre-release builds from 2014-2015, often labeled as "Windows 9 Pro" or "Ultimate". windows-9-ultimate-iso-32-bit-full-download-onhax
"Windows 9 Ultimate ISO" files are unofficial, bootleg, or modified ("modded") builds created by third-party users. They are typically based on early Windows 10 Technical Previews (e.g., builds 9834-9845) or re-skinned versions of Windows 8.1. "Windows 9 Ultimate" is not a legitimate Microsoft product
As they are unauthorized mods, they can be unstable, prone to bugs, and lack modern security updates. Risks of Downloading and Using they can be unstable