![]() When you install Mac apps, plug-ins, and installer packages from outside the App Store, macOS checks the Developer ID signature to verify that the software is from an identified developer and that it has not been altered. ![]() If you download and install apps from the internet or directly from a developer, macOS continues to protect your Mac. If there’s ever a problem with an app, Apple can quickly remove it from the store. Apple reviews each app in the App Store before it’s accepted and signs it to ensure that it hasn’t been tampered with or altered. When the new owner starts up the Mac, they can use their own information to complete setup.The safest place to get apps for your Mac is the App Store. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the setup assistant without completing setup, then click Shut Down. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.Īfter installation is complete, your Mac might restart to a setup assistant. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions.When you see a window with the option to reinstall macOS, your Mac has started up from Recovery.
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