I understand you're looking for a Windows 9 ISO, but it's important to clarify: They skipped from Windows 8.1 directly to Windows 10.
DOWNLOAD OPTIONS * 4.4G. Windows_9_9834_x64FRER_en-RU_DV9.iso download. * 4.7G. Windows_9_9834u1_x64FRER_en-RU_DV9.iso download. * Internet Archive Windows 9 ISO Please! - Microsoft Q&A
Marketing teams wanted to signal that the new OS was a major generational shift from the poorly received Windows 8, choosing "10" to symbolize a fresh start.
