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Purchased the game last night, but haven't been able to get past more than one "level" in the campaign, because the game freezes. The last three times I've tried to play, it freezes after two or three turns. Running it on a 2017 Macbook Pro, OS 10.14.6.
Weeks later and I remembered that I'd written this post but forgot to come back to say that the problem went away. Wish I could figure out why it happened, but I believe all I did differently was pick the other available battle from the first map using Calis.