Run fheroes2-install-demo command to download and install all the necessary
files from the demo version of the original Heroes of Might and Magic II game.
Run fheroes2-extract-resources command to extract all the necessary resource
files from a legally purchased copy of the original game.
Documentation is available at:
$HOMEBREW_CELLAR/fheroes2/1.1.18/share/doc/fheroes2/README.txt