As the Burning Crusade expansion was finished prior to the most current patch versions it will be necessary to re-patch to 2.0.3 once the expansion is installed. As some players remove their patches after they have been applied we would like to provide a helpful warning not to delete the “2.0.0-to-2.0.3” patch file as it will be required after the Burning Crusade is installed.

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Q u o t e:
I used the blizzard downloader, so it did it all by it self?

How do i save the file then, so i dont have to download it again when TBC comes, it took like 1-2hours

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Look in your WoW\Patches folder :)