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I had a similar problem even after reinstalling the game. Try cleaning up the profile on the C drive, deleting saves and other files; sometimes this can cause crashes.
Data on the C drive remains even after deleting the game, and after reinstalling, it is immediately linked to the game.
The truth turned out to be so close! I deleted all saves, deleted all hero versions, ran a cleanup program, reinstalled the game from the Remake, applied patch 3.1 - the game wouldn't launch at all. I went into the bin folder and selected not H5_Game.exe, but H5_Game.NCF.exe, and oh my God, finally everything started working. Dialogue boxes even started appearing, the game runs smoothly, everything loads in a second and a half. And the most interesting thing is that now everything is not as accelerated as it was before. Even at maximum speed, units don't act as quickly as before. Apparently, this was also part of the error.
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https://imgur.com/a/Y74oOjp 90% of the icons are, of course, incredibly cool, but whatever, the main thing is that everything works now. After capturing a castle in the first mission, a TEXT BOX appeared!!!