If you let us know which ones you're missing I can help with some hints.
Correct, those chapters aren't voiced in the free version (the Patreon version has chapters 1-3 currently voiced).
To get "The Good Ending" in The Party chapter, your need to first back away from the conversion, then alternate who you pick (Belle / Trish / Belle etc). If you do this same trick without backing away first you get a different ending.
We currently don't have plans to release the entire game for free.