All players in a multiplayer game have to use exactly the same version. You can check this when loading the game by looking at the top right of the screen where you will see a version number and checksum code.
The standard version for multiplayer play is the Doomsday edition with the 1.3a update. This has the checksum JCJS.
Some players still play the first edition of Hearts of Iron II with the 1.3a update. This has the checksum JLQC.
Some multiplayer players like mods such as Starfire and play them regularly. If you wish to experiment with mods like this, please copy your standard game folder and only modify the copy. You will then have an alternate version of the game and can use that separately without losing your standard, supported version.
Andrew
The standard version for multiplayer play is the Doomsday edition with the 1.3a update. This has the checksum JCJS.
Some players still play the first edition of Hearts of Iron II with the 1.3a update. This has the checksum JLQC.
Some multiplayer players like mods such as Starfire and play them regularly. If you wish to experiment with mods like this, please copy your standard game folder and only modify the copy. You will then have an alternate version of the game and can use that separately without losing your standard, supported version.
Andrew
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