Use the GOG GALAXY client to install the game; it will automatically include all owned DLCs by default.
You can also download DRM-free standalone installers from your account page on the GOG website . 2. Essential Gameplay Mechanics Hearts.of.Iron.III.and.DLC.Collection-GOG
Hearts of Iron III uses a "nested" expansion model where each major DLC builds upon and requires the previous ones. Use the GOG GALAXY client to install the
Always run the game through the Their Finest Hour (TFH) executable. The DLC Collection includes all three major expansions: Semper Fi , For the Motherland , and Their Finest Hour . For the Motherland