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The game is licensed, there are no mods at all, the bug manifests regardless of my actions. The only thing I managed to do is, if I move the heroes to the portals, the scenario with the ghost doesn't freeze, and it gives me the opportunity to reach the assassins. After that, either I defeat them, go to the ghost, and it freezes after the "choose a portal" message, or I let the assassins attack the demoness, and it freezes again.