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I left my Mac alone to install XCode overnight. The next morning I opened the console, and there were many errors regarding the Applications/Xcode.app/Contents/ After a minute I saw this message in the console: [UPD8E52C7E7/com.apple.dt.Xcode:497799835] Unable to remove lock xattr on app just updated: Error Domain=NSPOSIXErrorDomain Code=93 "Attribute not found" Request to set xattr com.apple.appstore.vendor_name on file /Applications/Xcode.app Received notice that app update is complete: com.apple.dt.Xcode : /Applications/Xcode.app [Crossfire] Apps installed: [com.apple.dt.Xcode] [UPD8E52C7E7/com.apple.dt.Xcode:497799835] Finishing with final phase: Finished, current phase Postamble I do not know what actually has happened, but it seems that the installation is stuck on reviewing the simulators (the more simulators you have, the more time the installation needs to go through them).