![]() Install while your Mac is started up in safe mode. Make sure that your Mac has a working and stable internet connection. Check your internet connectionĮven if you're not installing macOS from the internet, the installer needs the internet to get firmware and other information specific to your Mac. Apple provides a few troubleshooting tools to help you resolve. The most recent backup file is restored to your device. The other solutions here are organized starting with the easiest. Click the Summary tab and then click Restore Backup. ![]() If the message says that your Mac doesn't have enough storage space, learn how to free up storage space. If the message recommends a solution, such as to redownload the installer and try again, please try that first. Or use the OS X installation disc that came with your machine or buy a new one to. Download the relevant macOS or OS X installer from Apple, then use Terminal to create a USB installer you can boot up from. The cause of messages like these can vary, and sometimes they are only temporary. Install macOS or OS X from Internet Recovery Mode, which you can boot into by holding option+command+R while your Mac powers up. The message might say that an error occurred while downloading, preparing, or installing, or that the installer is damaged or could not be verified. If an error occurred while updating or installing macOS
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