i did it in another way:Ugh....this is a disaster. This whole chapters thing is fucked, my old saves don't work and starting a new chapter asks me a billion questions, most of which I can't remember the right answer to get me where I was in the story.
So basically I either just walk away from the game altogether or haphazardly answer all the questions and continue playing the story that doesn't feel like the one I was playing.
open the developer console and type-> jump Part7Begin
you will start playing the new content right away, obviously the game will give you an error each time the script encounters a variable that wasn't already defined but there's way less of those than the amount of question the chapter selection forces to go through. moreover, the error will give you the name of the missing variable that you need to initialize and the name alone for me was enough to remember what value to assign to the variable for each of my saves.
i had to set less than a dozen variables through my playtime and i could recreate my 6 saves with no other issues.
hope this helps you.