I don't know if its just me but for whatever reason after I update for Chapter 10, I can't replay chapters 1-9. I use android btw.
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That is weird, try updating the season 1(the current itch version) and play through the final chapter again (you should be able to load old saves.)Then dont deinstall season 1 but update season2 over it. Press new game and see if it works.
If that doesnt work, and since there is no Dm or chat function on itch.io You will have to join the discord, send me a Dm or a message in the help channel. I am sure we can get your issue fixed.