2. If everyone has HD+ selected. And the game doesn't crash immediately: I wait for everyone, set up random maps, establish alliances, and usually even manage to choose my castle, and then I get this message, and the co-op crashes. I have two ideas: maybe it's related to choosing the starting hero (1), and maybe someone tried to connect without HD+ from the outside (2).
2. If everyone has HD+ selected. And the game doesn't crash immediately: I wait for everyone, set up random maps, establish alliances, and usually even manage to choose my castle, and then I get this message, and the co-op crashes. I have two ideas: maybe it's related to choosing the starting hero (1), and maybe someone tried to connect without HD+ from the outside (2).