Hey there! There isn't a chapter 2. The update only added artwork for the endings that were already there. I do plan on working on an update that will add one more story route but for now it's not there.
Windows often claims files with unknown publishers to be unsafe. But any file I upload here on itch.io under my account is official and only contains the game! As long as you aren't downloading from some unknown site, it should be fine. 😄👍