Error during install
I have not played SC2 or WoW in many months. when I brought up WoW launcher it f course needed to update and before I could play it had to re-download and install 727 files (I assume this updated the agent folder) and hearthstone installed successfully.
Special thanks to BOTH the OP and Zodraslaus on page 2 for the reference to updating another blizzard game to fix.
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