Game crashes: questions and answers.

Decided to replay Heroes 5 and encountered a very unpleasant bug – when starting a campaign for the Tribes of the East, the game crashes during combat when Furies attempt to attack with melee. It doesn't matter if they are in your squad or the enemy's. If they aren't present, the game runs smoothly. But this is very inconvenient, as the first missions involve fighting against the Tribes of the East. In general, please help me figure out what's going on. P.S. I'm just a regular user, so please keep it simple.