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Many common hard drive or OS problems on a Mac can be resolved by running Repair Disk.
Standalone patches are downloaded outside of the game launcher or the Blizzard Battle.net desktop app.
Troubleshooting steps for disconnection problems with the Battle.net mobile app
Information about what to do if you are experiencing reduced performance on the Beta version of the Battle.net Desktop App
Information for troubleshooting Call of Duty: Vanguard launch issues