Three different issues are being discussed in this thread.
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Issue #1: An error appears on the login screen within the WoW client, or on character select.
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Issue #2: There is an error on the launcher preventing the use of the Play button.
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Issue #3: A repair or update loop is happening on the Battle.net client.
If you are dealing with Issue #1, the staff is updating another thread with info regarding a fix:
For Issue #2, chime in on the above thread to let them know it’s also affecting the launcher.
Finally, if you’ve encountered Issue #3, then you’ll want to follow the advice repeated in these threads (can jump to Blizzard posts with the buttons on the right-hand side by the scroll bar):
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[Main Thread] - WOW constantly updating but not installing anything
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[Main Thread] - Permissions errors updating or repairing games in Battle.net
Hopefully, this will get everyone to the correct places for updates and/or info needed to resolve issues.