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Duplicate key issue - multiplayer keys for Defcon and Multiwinia
Additional info

Defcon and Multiwinia come with one set of keys by default, to enable the single-player mode by default. Only one person can use these keys online at the same time.
To play these games online, you need to input your own product key. You can find it under My Account, right below the installer download options. Just copy this key, go into the game's Options -> Authentication menu, then paste the key and confirm.

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