Hmmm.
With the installer you provided, it works, both in langage and game dimensions.
However it is very strange that gruntmods edition (2021) have files with timestamp 2015, and the multilanguage installer you provided (2015) has files with timestamp 2021.
The only thing missing is now the brief videos showed at territory selection / mission selection: map is all desertic with no territory borders and no animations, and after the voice description (e.g.: "Atreides advance east, Harkonnen, retreat") you see the static map selection.