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So I've got a disc copy of Medieval Total War II, and Steam has the Kingdoms expansion for $5. If I buy it on Steam will it run all fine and dandy with the disc copy, or do I have to do something special to get them to work properly with each other?
Shouldn't you be able to enter the CD Key into Steam and activate the game, download it and then go ahead with the expansion. Thats what I did for some of my games that I have on disk which are older than Steam itself.
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So, no, you cant use steam to buy the expansion for your non-steam version
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