Thank you so much for playing!! (I was wondering if you would mind editing your comment to remove the spoilers? Some people read the comments without playing the game!)
As for the new update, I don't like to promise specific dates because I'm primarily a solo developer, and I don't want to rush out updates before they're ready (I didn't announce this release until it was completely done, haha!) But I'm aiming to release Day 5 sometime in the fall, and the third/last update (containing Days 6, 7, and 1) sometime early next year! Regarding the download, you will have to download the game again to download the new content, but your saves from the previous playthrough should still work, assuming I don't make significant revisions to the script.
(And no worries at all!! These are reasonable questions, I'm really honored that you're interested in playing the rest! 😊)