Rather than risking malware from unauthorized downloads, players can access free content through official channels: Downloadable content - Hearts of Iron 4 Wiki

While specific versions like are often advertised as "free downloads" on third-party sites, these are typically unauthorized pirated versions that lack official support and security. Legally, Hearts of Iron IV (HOI4) is a paid game, though Paradox Interactive frequently makes significant portions of content and specific expansions free for all owners of the base game. Legitimate Ways to Get HOI4 Content for Free