You can never use a key double ...no matter if you already have the base game and only missing the dlcs.
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No, nothing you can do. The key can only be used once. It will add whatever you were missing from it to your account and that's it.
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Got a question. I already had Killing Floor, but with no dlc, so I thought if I tried the key it would give me the dlc and then I'd be able to install the base game on my friends account. Well I used the key and I got all the dlc, but when I tried to install the base game on my friends account it said key was already used... I just got got jipped from a game. Anything I could do about this?
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