I have multiple computers and laptops. One from 2020, one from 2019, and one from 2018. All these devices come with windows 10 installed. I hate windows 10. I've tried going to windows 8.1 or 7, but they wouldn't work on any of the devices. reasonable because those are old operating systems. So, I said to myself "Since I can't go anywhere older than 10, what's the oldest version of 10 we can install? After installing over 15 builds of windows, I found the answer. Windows 10 version 1903. Anything older than 1903 would not work due to missing drivers. I find it kind of strange how that specific build is the oldest working one, even on my older devices. Can someone tell me, Why is 1903 the oldest one that can be downgraded to? All my devices are from different brands, different years, and have entirely different parts.