Hi there! So glad you're loving the story. I'm a solo developer so updates aren't on a fixed schedule and rather happen when they're ready, but I just released the next update to Patrons for Early Access, and it will come here to Itch on April 15.
Generally with new updates, you just download and either extract the files (PC and Mac) or install it (Android), and the game will automatically find your old save games. On PC and Mac, you can delete the previous version of the game. For Android, it should install on top of the previous version. I hope that helps!