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Download macOS Sierra 10.12 Final Mac App Store link You can manually look for macOS Sierra in the Mac App Store as well, but trust me, it's going to be a mega hassle. Download Apple MacOS Sierra for Mac to rediscover your best photos, shop faster and conveniently online, and even Siri makes its debut on the latest OS update for Mac.
If a new version of macOS becomes available, there are a lot of people who are considering a clean installation, a so-called clean install. This can come in handy when you restore the Mac factory settings. You make a fresh start on your Mac, without taking all the previous problems and it also comes in handy if you have taken over a Mac from someone else and want to start with a clean Mac. In this case we use Sierra.
Note: make sure that you always have a backup of all your files and data should something go wrong! You can do this, for example, via a Time Machine or another external hard drive.
Clean Mac installation
Sierra is the latest version of macOS (at time of writing). If you want to install this or all of the following updates, you can simply do so from the Mac App Store. In addition, all user data is retained. The big advantage is that you do not have to worry about it: you just have to press a button and have some patience. But you also include all the junk from previous installations. If you want to start over with a clean Mac, you have to reset the Mac factory settings and perform a clean installation. In doing so, the complete content of your disks is deleted.
macOS clean installation from a USB stick
Before you get started, you will first need to install a version of macOS on a separate USB stick. You need a USB stick with at least 16GB of storage.
Download macOS Sierra (or another version) from the Mac App Store. Apple itself maintains a list of older software, which you can find via the official Apple Support download page. This is system software for your older Mac, but you will also find security updates and older versions of QuickTime, Safari, iMovie, Pages, Keynote and the like. Click Load more results repeatedly to see older software.Click here to go to the Official download page at Apple Support.
After the download is complete, you must disable the installation screen that appears, to prevent the installation from starting. Insert the USB stick into your Mac and give it a logical name, for example ‘macinstallation’. It is important that no special characters are allowed in it. Start the program Terminal via Programs – Utilities – Terminal or search for it in Launchpad. Enter the command below in Terminal.
Note that the word behind Volumes must be exactly the same as the name of the USB stick. The path can also be different if you want to install a different version of macOS.
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Perform clean installation
Installing a clean installation of macOS is the next step in the process. Carefully follow the steps below, so nothing can go wrong. Insert the USB stick with the installer in your Mac andrestart it with the Alt / Optn key pressed. The macOS Startup Manager will pop up with all bootable drives and devices that are connected. Select the USB stick that you had prepared for the installation and press Enter. The Mac will now boot from the installer on the USB stick. This can take a few minutes, depending on the speed of the USB port and the USB stick. Once this is done, the Mac will return to the macOS Utility startup window. You get a number of options there, such as Restoring a Time Machine backup. Choose Disk Utility. In the following steps your startup disk will be completely erased, so you can start with a clean slate. Select the desired startup disk. This is usually Macintosh HD.
Then click Clear to delete the entire disk. Also make sure that the format is set to macOS Advanced (Journaled). The Disk Utility now deletes the entire disk. Once this is done, you can close this program. After this you will return to macOS Utility. Now select Install macOS and the installation of Sierra will now take place. During the installation process, choose the correct drive you just deleted, such as Macintosh HD.
After these last steps you will be guided through the standard macOS installation procedure. Once everything has gone well, you have a completely clean Mac with the latest version of macOS. Of course you do not lose everything. When you log in with your Apple ID, all personal details such as calendars and e-mails are synchronized with iCloud.
These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Download macOS
Find the appropriate download link in the upgrade instructions for each macOS version:
macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.
Use the 'createinstallmedia' command in Terminal
- Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
- Open Terminal, which is in the Utilities folder of your Applications folder.
- Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace
MyVolume
in these commands with the name of your volume.
Catalina:*
Mojave:*
High Sierra:*
El Capitan: - Press Return after typing the command.
- When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
- When prompted, type
Y
to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created. - When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath
argument, similar to the way this argument is used in the command for El Capitan.Use the bootable installer
After creating the bootable installer, follow these steps to use it:
- Plug the bootable installer into a compatible Mac.
- Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it. - Choose your language, if prompted.
- A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
- Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.
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Learn more
For more information about the
createinstallmedia
command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:Catalina:
Mojave:
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High Sierra:
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El Capitan: