You will find threads explaining how to manually install mods from the Steam Workshop (using external downloaders) for use with non-Steam versions of the game.
For six months, he’d been building Twilight of the Empire —a total conversion mod for Hearts of Iron IV . It was a masterpiece of alternate history: a fractured 1936 where the Austro-Hungarian and Ottoman Empires never fell, creating a three-way Cold War between monarchism, fascism, and a fragile, paranoid Soviet Union. The focus trees were sprawling novels. The unit models were painstakingly retextured. The balance was a razor’s edge. hoi4 cs rin