Because there is no official version, any file labeled as "Windows 9" is likely one of the following:
Windows 9 All in One 2022 : RetroPCInfo : Free Download, Borrow, and Streaming : Internet Archive. Windows 9 ISO Please! - Microsoft Q&A windows 9 iso file download free 64 bit upd
Before Windows 10 was announced, Microsoft was testing early builds of the next OS. These were technically "Windows 9" in the sense that they were the development builds before the name change. Tech enthusiasts can find these leaked ISOs on obscure forums. They are essentially broken, unpolished versions of Windows 10 with different UI placeholders. They are unstable, unsafe for daily use, and definitely not "free updates." Title: The Ghost in the Machine: The Strange
Microsoft does not provide or support an official Windows 9 ISO. The "Threshold" Leaks (The Real Ghost) Before Windows
if(version.startsWith("Windows 9")) // Do stuff for Windows 95 or 98