There are several theories regarding why Windows 9 was skipped, ranging from technical hurdles to marketing strategy:
If your goal is to "develop" a custom version of Windows with specific features, you can use professional tools to modify an official ISO: Windows "9" Technical Preview on Actual Hardware! windows 9 iso
Windows 10 Technical Preview: Early builds of Windows 10 (Threshold) are the closest thing to Windows 9 that exists. Some enthusiasts have repackaged these early 2014 builds as "Windows 9" ISOs. There are several theories regarding why Windows 9
The "New Beginning" Strategy: Windows 8 had a poor reputation. Microsoft wanted to signal a massive leap forward rather than a incremental update. Jumping to "10" helped position the OS as the "last version of Windows" and a unified platform for all devices. The "New Beginning" Strategy: Windows 8 had a
: Requires a valid Windows 8.1 product key for full functionality; it is not a free or pirated "activated" version by default . 2. Community Archives