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FOUND Solution: Go to C:\ProgramData\Battle.net
Delete all 3 files (Agent, Clent, Setup)
Reopen the SC client getting the error and it should install properly.
After downloading the patch and starting it up it should work.
IF YOU GET A LANGUAGE ERROR CODE (most common in Korean Clients but can happen in ANY)
Go Here: http://us.battle.net/sc2/en/forum/topic/6248186508
What you need to do
Make sure starcraft 2 is not running. Wait a few seconds if you just exited the game.
Change variables to equal the following:
This will ignore region-language check and use whatever is available in the starcraft.exe 's folder it's running from.
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