Hi! Sorry to reply late, itch wasn't kind enough to let me know that you'd commented 😅 I'm not sure if you've played through the game yet (please keep in mind the game is 18+), but the point of the game is to romance Siruud or Tahira. Usually their routes update one at a time, but the last update was for both of them (which meant that people anticipating a Siruud chapter could also expect one for Tahira).
As far as troubles updating, I can't quite pinpoint what the problem would be. The game is automatically played through the browser. I don't have any directions for updating besides "play through again", and if you're playing the version that has the save building feature, then you're already playing the latest version. The only thing I can confidently say is that you can't play chapter five because it doesn't exist: I only have three chapters available at the moment.