There was a slight bug involving the way certain scenes were registered as having happened, so I would recommend loading up saves from before day 19 to avoid any weird bugs.

-Added new full scenes for Ash and Trish
-Added subroute scenes for Ash & Sarah, Chloe & Madison, Holmes & Malia, Jenna & Zoey, Katy & Rachel, Malia & Trish, and Penny & Zoey
-Added replay scenes for new Day 19 content
-Updated pdf walkthrough with later Day 19 scenes
-Fixed a bug involving route requirements at Day 19 start
-Fixed a big involving Day 19 scenes looping back to Day 18 after
That means that day 19 is complete with full implementation of gallery scenes, walkthrough icons and pdf walkthrough.