You can now quit Terminal and eject the volume.ĭepending on which macOS you downloaded, enter one of the following commands in Terminal as instructed above. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Sonoma. Terminal shows the progress as the volume is erased.Īfter the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal doesn't show any characters as you type. When prompted, type your administrator password. If the volume has a different name, replace MyVolume in the command with the name of your volume. Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Type or paste one of the commands below into Terminal, then press Return to enter the command. Open Terminal, which is in the Utilities folder of your Applications folder. Enterprise administrators: download from Apple, not a locally hosted update server.ĭownload a macOS installer using the App Store or your browser Use Terminal to create the bootable installer Your Mac must also be compatible with the macOS that you're downloading. To download a full installer, your Mac must be using macOS High Sierra or later, the latest version of macOS Sierra, or the latest version of OS X El Capitan. ![]() What you need to create a bootable installerĪ USB flash drive or other secondary volume with at least 14GB of available storage, formatted as Mac OS Extended You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful if you want to install macOS on multiple computers without downloading the installer each time, or you're unable to install a compatible macOS from the Finder or macOS Recovery. I think it is therefore necessary to replace the internal HDD with a 128 or 256 GB SSD.These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal. and I was able to reboot my iMac mid 2010 (with very long USB loading times). So I installed High Sierra 10.13.6 on an external hard drive (USB) to test my guess (HDD corrupt). This is probably due to a problem on the internal hard drive, the original 1TB HDD. At each attempt, this message appeared: cannot complete the installation due to a problem. Unfortunately, none of the various attempts were successful. Then I created an installer via usb stick, and tried to install the operating system on my iMac Mid 2010 (iMac11,3). I was able to download the macOS High Sierra 10.13.6 full installer version thanks to a mid 2012 macbook pro with macOS El Capitan installed.Īll other attempts with the latest mac book pro and already installed versions of the operating system (Catalina or Mojave) have been unsuccessful. Restart your mac and try downloading High Sierra again. ![]() I am not entirely sure it will make a difference but uncheck that box. "Downloading new updates." is a bit misleading it is in fact downloading Install macOS High Sierra.appįrom your earlier screenshot of the Software Update panel you have checked the box Automatically keep my mac up to date. When I click on Download the Software Updates window opensĪnd after a couple of minutes I see this, This will redirect you to the App Store High Sierra page Go to Section 4 and click on Get macOS High Sierra How to upgrade to macOS High Sierra - Apple Support (My mac is/ was capable of running High Sierra) ![]() I am doing this on a mac with macOS Mojave 10.14.6 installed. If that is not the case then I probably do the same a you. ![]() Apple does not take into consideration that you want to download the installer and then install it on another older compatible mac. The reason I ask is that any mac that came preinstalled with a newer OS than High Sierra will not be allowed to download High Sierra or any older OS. Mike you are trying to download High Sierra to your MacBook Pro, did this MacBook Pro come preinstalled with Mojave or Catalina.
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