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How your WOW account can upgrade for TBC

How your WOW account can upgrade for TBC
You would have to buy the Burning Crusade download or box set, and install it on your PC (which already has classic WoW installed). It will then prompt you to go to your battle.net account page, and add a game. Here you then fill out the activation key that came with TBC, and your account will be upgraded as well.