You can check your version and checksum in the bottom-left corner of the main menu once the game is launched. 2. Risks of "Free" Downloads

An unmodded, vanilla installation of v3.04 should have the checksum WNVU .

Sites offering "cracked" versions are often flagged for malware or unwanted software.

Victoria II frequently goes on sale for very low prices, often making the risk of a "free" download unnecessary. Victoria II v3.04 for non-Steam clients - Checksum WNVU

While many launchers still display v3.03, v3.04 is the final official patch for Victoria II.