Launch the App Store app, then look for macOS Sierra in the store. ( Here’s a link.) Click on the Download button, and your Mac will download the installer to your Applications folder. Downloading installer packages from the Mac App Store with AppStoreExtract November 19, 2015 rtrouton Leave a comment Go to comments As part of my work, I occasionally need to download installer packages for certain applications from the Mac App Store. If you're using OS X El Capitan v10.11.5 or later and your App Store preferences are set to download newly available updates, Mojave will download conveniently in the background, making it. If you’re using a Mac laptop or desktop from the last five years or so, you should be able to download OS X Mavericks for free just by visiting the Mac App Store.
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Before selling your Mac, it’s always a good idea to wipe its startup disk clean and then erase your computer and reinstall macOS. And should your computer exhibit issues preventing it from starting up properly, reinstalling macOS will bring it to perfect working order.
Reinstalling macOS is a piece of cake provided you have created a USB install disk for El Capitan to begin with. As you may have guessed, not many people take that extra step.
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In helping take the pain out of reinstalling macOS, Apple has included so-called Recovery Mode in macOS. Invoked at boot time, Recovery Mode helps you check your connected disks for errors, get help online and reinstall macOS.
This tutorial covers entering Recovery Mode and taking advantage of it to erase, install or reinstall the latest version of macOS that was previously found on your Mac.
The step-by-step instructions provided below will restore your computer to factory settings.
Before reinstalling the factory-preloaded version of macOS, you can decide to optionally erase your startup disk. Before proceeding, make sure you have backed up your essential files and documents to an external drive, a USB thumb drive or Time Machine.
How to erase, install or reinstall macOS in Recovery Mode
1) In the Apple menu choose Restart, or power on your Mac.
2) Hold down the Command (⌘) – R combination immediately upon hearing the startup chime. Hold these keys pressed until the Apple logo appears.
If you have a Mac notebook, press the keys on its built-in keyboard because the Recovery Mode keystroke may not necessarily register on external or wireless keyboards.
Tip: To reinstall macOS without deleting your files and settings intact, jump to step 7.
“Generally you don’t need to erase your startup disk to reinstall macOS,” explains Apple. “The macOS Installer is designed to allow you to perform an install in place over the same version or earlier versions of macOS.”
3) Select Disk Utility and click Continue.
4) Select the intended volume name from the left side and click the Erase tab.
Tip: To see additional disks, click the button Show All Drives.
5) In the Format pop-up menu, choose Mac OS Extended (Journaled), type a new name for your disk and click Erase. This will erase all the information from the disk, including your personal data.
Tip: Click Security Options to select options for securely erasing the disk.
6) After the disk has been erased, select Disk Utility → Quit Disk Utility.
7) Now choose Reinstall OS X and click Continue.
8) In the pane where you select a disk, select your newly formatted partition and follow the onscreen instructions. You may be prompted to authorize your Mac with an Apple ID.
Ensure your Mac is connected to the Internet via Wi-Fi (DHCP mode only) or Ethernet. If you have a Mac notebook, plug it into the power adapter.
RELATED:How to create USB install disk for OS X El Capitan
Requirements for reinstalling macOS in Recovery Mode
If Recovery Mode is used to install macOS, your Wi-Fi or Ethernet network must use DHCP (only WPA/WPA2 Wi-Fi authentication is supported in Recovery Mode).
You cannot reinstall macOS in Recovery Mode if your Mac is connected to a Wi-Fi or Ethernet network that uses the following authentication methods:
- WEP
- WPA-Enterprise
- Certificate-based authentication / 802.1x
- Proxies (where specific proxy servers must be configured in network preferences)
- Captive Wi-Fi networks (where you click an “Agree” button to access the Internet)
- PPPoE (where there is no router handling the PPPoE connection)
If your Internet connection has requirements or settings that are not supported by macOS Recovery, try changing the settings on your router to a supported configuration for the duration of the macOS installation process.
RELATED:How to repair disk permissions on your Mac
Recovery Mode unavailable? Use Internet Recovery
Recovery Mode mounts a recovery system image with the recovery tools from a hidden recovery partition on your startup disk. If this partition, which also holds an image of the macOS installer, becomes damaged, you won’t be able to enter Recovery Mode.
Thankfully, 2012 or newer Macs with OS X Lion or later can be booted directly from Apple’s servers. This is known as Internet Recovery Mode.
Internet Recovery basically downloads a recovery system image from Apple’s servers, and then starts up your Mac from it. It’s your only option in case you cannot enter the normal Recovery Mode or your Mac’s startup disk has become corrupted, damaged or replaced.
RELATED:How to start up your Mac in Internet Recovery Mode
It’s important to keep in mind that Internet Recovery Mode lets you install a version of macOS that came preloaded on your Mac at the time of purchase, not the most recent version that you may have upgraded to through the Mac App Store.
To enter Internet Recovery, restart your Mac and hold down the Command (⌘) – Option (⌥) – R after hearing the startup chime. You will be asked to connect to a Wi-Fi network if your Mac isn’t already connected to the Internet via Ethernet.
Depending on your Internet connection, booting into Internet Recovery Mode may take a while. After reinstalling macOS in Internet Recovery Mode, use the Mac App Store’s Updates tab to upgrade your operating system to the most recent macOS version available.
Some older Macs with OS X Snow Leopard may be able to use Internet Recovery Mode after installing OS X Lion or later, and a firmware update.
Things you can do in Recovery Mode
Recovery Mode and Internet Recovery Mode both provide the same recovery tools which permit you to perform the following maintenance tasks on your Mac:
If your Mac’s startup volume and its recovery partition are damaged or corrupted, the computer will automatically enter Internet Recovery Mode when powered on.
Related tutorials
Check out these resources that cover a myriad of ways you can start up your Mac:
For even more how-tos, browse our complete archive of Mac tutorials.
Need help? Ask iDB!
Not sure how to do certain things on your Apple device? Let us know at [email protected] and our future tutorials might cover your specific problem and provide a solution.
Submit your how-to suggestions at [email protected].
Apple uses its App Store to distribute its software, like new Mac operating systems. It’s convenient, but sometimes it can take a while for a download to finish. And if you have multiple Macs, it’s inefficient to download the new OS to each and every Mac.
That’s why I like to make a bootable external drive for the sole purpose of installing the Mac operating system. When I need to tend to a bunch of Macs, it’s much faster to use a bootable drive instead of going to each Mac, launching the App Store, searching for the operating system, downloading it (after entering my Apple ID), and then running the installer.
You can create a bootable USB flash drive with the macOS Sierra installer that’s now available. The installer software will take up nearly 5GB of storage space. Here’s how to create a bootable macOS Sierra installer drive.
Macworld also has bootable-install-drive instructions for:
- Lion (OS X 10.7)
Download the macOS Sierra installer
Launch the App Store app, then look for macOS Sierra in the store. (Here’s a link.) Click on the Download button, and your Mac will download the installer to your Applications folder. If it automatically launches after download, quit the installer.
If you’ve already upgraded your Mac to Sierra, the installer is removed from the Applications folder. You can download it again if you go to Purchased in the App Store. Look for macOS Sierra in the list of apps that you’ve bought, and click on the Download button. If it automatically launches after download, quit the installer.
Get an external drive
You can use a USB flash drive or a hard drive with room for the installer software. I’ve used different drives with success, including a VisionTek 120GB USB 3.0 Pocket Solid State Drive ($83 on Amazon) and an old 8GB Iomega Micro Mini Hard Drive.
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Don’t worry if the drive isn’t formatted for the Mac. The drive will be reformatted automatically as part of the process. Change the name of your drive to Untitled; you need to do this for the steps below.
The quick and easy way
The process detailed below involves the Terminal. If your really don’t want to use Terminal, there are a couple of free apps you can use.
- Install Disk Creator is a straightforward way to create a boot disk. I was able to make a macOS Sierra external USB boot disk in a few minutes, and the installation worked without a hitch. Also works with older versions of OS X.
- Diskmaker X is a popular app. It also supports older versions of OS X.
Use the Terminal to create a boot disk
So you have your external drive, and the Sierra beta installer is in place. Now you’re going to use Terminal to create a boot drive. If you’ve never used Terminal before, don’t worry. This is pretty easy.
Here are the steps to create a macOS Sierra beta boot disk. (Apple also has these instructions.)
- Connect the external drive to your Mac. (In the Terminal command you will use, I use
Untitled
to represent your external drive. If your drive is named something else, you need to changeUntitled
to the name of your drive.) - Launch Terminal (/Applications/Utilities/Terminal.app).
- Copy the following:
sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS Sierra.app
- Go back to Terminal and paste the copied code at the prompt.
- Terminal will ask for a password. This is your user password. Terminal doesn’t display characters when you type it in. Hit Return.
- Terminal will tell you that it will erase your drive. To confirm that you want to continue, type Y and hit Return.
- You’ll see that Terminal erases your drive. When that part is done, your Mac may ask you if you want to use the drive for Time Machine. Click Don’t Use.
- Terminal will copy the installer file to your drive. This will take a few minutes.
- After copying, Terminal is done. You should see Terminal display a “Copy complete” and Done notice. You can quit Terminal and your drive is ready for use.
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How to boot from the installer drive
- Plug your external drive into your Mac.
- Power up (or restart) your Mac. Press down on the Option key while the Mac boots.
- After a few moments, your Mac should display the Startup Manager, which will show you the available boot drives. Click on the external drive and hit Return. (You don’t need to select a network to proceed.)
- Your Mac will display an OS X Utilites window. If you want to install Sierra and leave the data intact, select Install OS X. If you want to start over and wipe out the data, you need to go into Disk Utility to reformat the internal drive first, and then install macOS Sierra.
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What to do when ‘this copy of the install OS X application cannot be verified’ or ‘the installer payload failed signature check’