IAccount upgrade code. This code can be used to upgrade an existing World of Warcraft account for the Burning Crusade expansion. Use of this upgrade code REQUIRES that you already have the WoW Burning Crusade client, which can be obtained by CD installation or by direct download from the World of Warcraft website. The direct download requires credit card information before the client can begin download. If you upgrade your account without installing the client you will be blocked from entering the game. You have been warned! This is a North American & Oceanic account code, and can be used for account upgrades on those realms.