This error occurs when the Battle.net desktop app cannot write patch files to your hard drive. Follow the steps below to resolve the issue.
Configure your security software's exception list to allow Blizzard applications to run.
Try closing background applications to resolve any software conflicts.
Try running the game on an administrator account to resolve permissions issues.
Run ScanDisk and defragment your hard drive to try to repair any bad sectors.
Note: Do not defragment a Solid State Drive (SSD).
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