Wonderful game. I was waiting for the next update since! But I think there's a bug in the middle of Josh's route. I can't click the arrow in the courtyard where the hunter should go for his third investigation.
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If you're up for it, we could do some tests. I'll build a few versions of the game here using the same files, with minor modifications, and you can try installing them and see if the message appears or if any of the versions installs without problems.
Maybe a little tweaking will solve your problem, but I'd really have to test it to find out.