This is Geodemon's R.E.D. WWII Edition mod, version 40, modified by me to add Hungary and a fall of Yugoslavia event, plus other lesser goodness. Full description (about to be) in a thread over in the main R.E.D. WWII forum. To install, delete R.E.D. WWII v40 (but keep the data files v5, please and thank you) from your mod folder, download this, and unzip to your mod folder.
