For me when I was younger I used to play some mobile game called 'World Conqueror 2' when I was in middle school, and it's simplicity and general map inaccuracy made me look outwards and I found EUIV eventually.
Same for me! Though my journey started with EU2 and HoI. Back in the day I wasn't even aware what a patch is and so I kept playing on 1.0 all the time. Didn't matter much to me anyway, since without the help of Montezuma, Drake, Gustavus and House of Orange I wasn't able to play ;pWhen I was a kid my parents used to by me one of those PC games journals, some of them had an extra CD with free games and demos. One of them had Europa Universalis 1 for free. I've been hooked on Paradox game ever since.