did you download the fixed version? btw I think you have to into join calls with feli and luca when there was an option either to join calls or not and then got the two into a relationship, this is when the two dm'ed you asking if you think vince and ai are together, I'm not sure but that's the only thing I did different and my character personality is "sarcastic" when I saved a certain scene. I hope this helps, sorry if it's not. Oh and if you haven't downloaded the fixed version, just scroll down a little in the comment section and you'll see link from rosesrot somewhere in someone's reply.
Ohh I see the problem here, so here's what you need to do to play the fixed file, open your file, went to download and search for the file you've downloaded the, icon's probably the stacked book thing. All you need to do is right click on the file and press "Extract All..." if a tab pop up, click "Extract" and wait for it to finish. After that you'll see a new file named "KillerChat-1.1-pc(or other device you're using)", click on it, click again on the opened file then search for the one named "KillerChat" and the file type is "Application". Then there you go! I hope this help.