In the updated version, I'm trying to replay the first mission. Diarrel has appeared – it seems like there will be another enemy, probably to make things more challenging. Okay, let's see.
In general, both the old and this version are buggy. Saving constantly freezes, and after loading saves, it crashes, and this only happens with this campaign.
There are no other maps or campaigns in the folders. The game is installed from the Gold Edition, version 3.1 is installed, and the computer is good enough for Heroes 5, it should run on maximum settings. I don't even know what to do...