Installation menu after update

I'm gonna ask a real dumb quation but still, i want to know if a malicious thing going in my pc:smile:
Soo i rebooted my pc because i was having issues with my wifi connection
And its apparently updated (build 18362.836) in the background before i rebooted the pc,
After the reboot i entered my password and it took me to some menu (looks like some installation screen, that's why i wonder about it)
i didnt really paid attetion (that's why i don't know what was that but from what i can remember it asked me to connect to the internet and after i connected i pressed next and it took me to microsoft account login screen, i dont have microsoft account so i hit the skip at thew buttom and it just took me to my desktop
i cant find anything related to it, so is it part of some update and if it dose, what is the update/why i needed that screen?