Brings the nations from the Crimson Skies games and adds them to Hearts of Iron 4.
How to install. Go to Documents, Paradox Interactive, Hearts Of Iron IV, mod. Open the winrar file that you downloaded and drag the Crimson Skies folder and the Crimson Skies.mod file into the mod folder. Load up Hearts of Iron 4, and select Crimson Skies and you're done.