"Microsoft wants to get into the video game live streaming realm. The tech company’s Xbox division has acquired Beam, a startup that is characterized as a competitor to Amazon-owned streaming platform Twitch."
Windows 10 feature updates now come two times a year, in March and September,
i.e. 1703 is March 2017, 1709 is September 2017 etc.
Those updates are in fact full installs in a separate folder, and then all files and apps are copied from previous version. That takes a long time, and previous version takes a lot of space (20GB or more).
The old version is saved in "C:\Windows.old" folder, to be available for "undo" if needed.
To reclaim space from previous version: