After every playthrough, there are scenes after the credits. Make sure you watch these all the way through until you get a message about a new path unlocking.
I think there may be a minor bug happening if you already completed all the routes before the new update, OR if you play Julian's path last. If my theory is correct, replay Maddy's, Liam's, or August's post-credits ending sequences until you get the New Story + Unlock message. Let me know if that fixes it. I'll also work on a patch to make this update smoother for those who experienced this.