This error occurs when the Blizzard Launcher can't read recently downloaded patch files. This may be caused by hard drive corruption, missing game files, or corrupt Battle.net Tools files. Follow the steps below to resolve the issue.
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If you have tried all of the steps for your operating system and still require assistance, please visit our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) or contact us.
Article ID: 491