WebApr 30, 2024 · If you see a warning message and can’t install an app If you have set your Mac to allow apps only from the App Store and you try to install an app from elsewhere, your Mac will say that the app can't be opened because it was not … WebSep 3, 2024 · On an Intel-based Mac: Restart your Mac and before the startup chime: Press and hold Option-Command-R until you see the spinning globe. In the Recovery app window, select Reinstall macOS, then...
Safely open apps on your Mac - Apple Support
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Mac Won’t Boot from Bootable Install Disk? This Might Be Why
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