1.Put the all files into your hearts of iron installation folder ...\SteamLibrary\steamapps\common\Hearts of Iron IV 2.Add the Hoi4 Launcher.exe as 3rd party steam game or create a shortcut 3.You can enable debug mode in settings 4.Newly subscribed mods will only be visible after you press refresh mods(next to the search bar).
Virus scanner might flag it. Add an exemption, or compile it yourself with the available source code but dont message me about it.