Install while your Mac is started up in safe mode. As an example, a 2009 Mac Pro that is not supported has much better specs than the 2009 Mac mini that is supported. What isn't clear is why some models made the cut and others didn't. Make sure that your Mac has a working and stable internet connection. Aside from two late 2009 Mac models (MacBook and iMac), all Macs older than 2010 aren't able to run macOS Sierra. 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. The other solutions here are organized starting with the easiest. 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. The cause of messages like these can vary, and sometimes they are only temporary. The message might say that an error occurred while downloading, preparing, or installing, or that the installer is damaged or could not be verified. Just be aware though that a bootable dvd takes a lot longer to boot up than a bootable usb.If an error occurred while updating or installing macOS and then boot to startup manager with option key to select the dvd. To do this copy and paste these into terminal to make the bootable iso file (assuming you have the Sierra installer in your Applications folder): hdiutil attach /Applications/Install\ macOS\ Sierra.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app hdiutil create -o /tmp/Sierra.cdr -size 7.85g -layout SPUD -fs HFS+J hdiutil attach /tmp/ -noverify -nobrowse -mountpoint /Volumes/install_build asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/ cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/BaseSystem.chunklist cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/BaseSystem.dmg hdiutil detach /Volumes/install_app hdiutil detach /Volumes/OS\ X\ Base\ System/ hdiutil convert /tmp/ -format UDTO -o /tmp/Sierra.iso mv /tmp/ ~/Desktop/Sierra.iso A bootable iso file called Sierra.iso will then appear on your desktop and you can use this to burn it to a dual layer dvd: sudo drutil burn /Users/YOURNAME/Desktop/Sierra.iso where you replace "YOURNAME" with the username for the account you are logged into at the time. At least you can boot and get Sierra installed to an otherwise unbootable drive (or reinstalled over an earlier installation nondestructively). As a workaround, do an actual installation to your flash drive, then just copy the new installer to that drive's Applications folder. The createinstallmedia command will fail with the new Sierra installer. To learn how to perform a clean installation of macOS using the bootable USB drive method, click one of the following links: macOS Catalina, macOS Mojave, macOS Sierra. You can find the latest official download links below for the last six versions of Apple's Mac operating system, all of which contain a new certificate that has not expired: Doing so will also ensure that you have all of the macOS updates that have been released since you made the original installer, meaning you won't have to update macOS immediately after the initial installation is complete. To fix the damaged installer, you should just download the installer again. If you tried to use a macOS installer in the last few days or weeks, you may have been met with an error message saying something like " This copy of the Install macOS Mojave.app application is damaged, and can’t be used to install macOS."Īs Apple explains in a newly published support document, the likely reason for the "damaged" error message is an expired certificate. Secondary-click, or two-finger tap with trackpad, on the running installer app from the dock and choose Quit. Once the download gets complete, you’ll see the installer window. Download Sierra or El Capitan OS from the App Store Step 2. If you tried to run your installer recently and unexpectedly received an error that it is damaged and can't be used, then don't worry – keep reading for a simple and straightforward way to fix it. Click on the Purchases tab, locate macOS Sierra and click the Download button. Creating a macOS installer on a bootable USB drive provides a convenient way of installing a fresh copy of macOS on multiple Macs, and also allows you to perform a clean installation quickly and easily.
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