This error occurs when the Blizzard Setup program cannot run after an update. This is usually caused by another application preventing the Setup program from making changes to the game files on your computer. 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, visit our Technical Support Forum (World of Warcraft) (StarCraft II) (Diablo III) (Hearthstone) or contact us.
Article ID: 100519