It said on the changelog this update adds Lena's friday, but it still ends on thursday for me.
Generally this happens because of one of two things in Renpy games in my experience (assuming it's not a path that didn't get any new content):
1) If you just unzipped the latest version over the previous version, sometimes a file gets left in from the previous version that is removed or renamed in the new version. Renpy loads all the files it can find in the game directory when starting a game, so leftover files from previous versions can sometimes cause issues depending upon variable names, labels, etc.
2) If you're starting a save from the previous version, sometimes a variable has been changed/added that isn't present in your save, or your save is past a newly added/changed label or point in the game and it doesn't catch a branch or other sort of jump into the new content.
I generally always put new versions in a new folder and delete the previous version to avoid problem #1. Problem #2 I'll generally load a save from the chapter or version before the previous version. Sometimes you have to start from the beginning, though Eva Kiss has usually been good about not breaking saves in this manner; other devs aren't as good at it.