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.

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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.

There's no 'Install macOS High Sierra.app' file, though the download took 98 minutes. A search on my computer for the 'Install' app brings up nothing. There is an icon in my dock labeled 'Install MacOS High Sierra', but I can't find the app anywhere where I can see its size or delete it. Oct 04, 2017 I have a MacBook Pro running El Capitan that I need to upgrade to Sierra 10.12 (not High Sierra) for development reasons. I have previously upgraded my personal computer as follows: El Capitan - Sierra - High Sierra. Knowing that, I should be able to see the previous version in the App Store as outlined in this answer.

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.

Alternatively, the bootable installer for macOS Sierra may be directly created from the “.app” file using the “createinstallmedia” command, as suggested by Apple. If this workaround has helped you to get macOS Sierra easily or saved your Internet bandwidth on single or multiple installations, let us know in the comments below. Attempting to download macOS High Sierra from the Mac App Store I found that a small 19 MB version of the “Install macOS High Sierra.app” file downloads to the “Applications” folder, rather than the complete 5.2 GB installer file.

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.

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.)

1. 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 change Untitled to the name of your drive.)
2. Launch Terminal (/Applications/Utilities/Terminal.app).
3. Copy the following:
   sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS Sierra.app
4. Go back to Terminal and paste the copied code at the prompt.
5. Terminal will ask for a password. This is your user password. Terminal doesn’t display characters when you type it in. Hit Return.
6. Terminal will tell you that it will erase your drive. To confirm that you want to continue, type Y and hit Return.
7. 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.
8. Terminal will copy the installer file to your drive. This will take a few minutes.
9. 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.

How to boot from the installer drive

1. Plug your external drive into your Mac.
2. Power up (or restart) your Mac. Press down on the Option key while the Mac boots.
3. 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.)
4. 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.

Installing a new version of Mac OS Sierra should be an easy job. Your Mac will simply tell you an update is available through a popup in the Notification Center. With just one click, you can go ahead and initiate the installation. However, in some cases, while updating your OS, things can get a little messed up. As a result, the Mac OS Sierra installation gets stuck.

There are many possible reasons why the installation is interrupted. It could be there has been a power shortage. It could also be there is not enough space available on your Mac. Perhaps, there are other issues with your Mac prior to updating. But regardless of the reason, we’re here to give you all the possible solutions for a stuck Mac High Sierra update.

Prior to a Frozen High Sierra Installation

If you still haven’t got past through the download stage, here are a few solutions to try:

1. Check the servers of Apple.

Whenever Apple releases an update for High Sierra, many Mac users will rush to download it. Because of that, Apple’s servers slow down. Thus, your first course of action should be to check the System Status page of Apple and see macOS Software Update to find out if there are problems.

2. Switch to a wired network.

Believe it or not, downloading the update is much quicker when you use a wired connection than when you tap to a WiFi network.

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3. Cancel your download.

One of the possible fixes for a stuck download is to simply cancel it. Start by navigating to the Mac App Store. After which, look for the update you are downloading. Finally, press the Option/Alt key. There should now be an option to cancel your download. Click the Cancel button, and you should be able to restart your download without any problems.

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4. Download the update from the support website of Apple.

If you are still having issues with downloading the update through the Mac App Store, visit Apple’s website instead.

How to Know If the Installation Has Stalled

Generally, if there is a problem with the software installation, it will show on the screen. In some cases, an Apple logo with a loading status bar will show. Sometimes, you will see a “spinning beach ball”. On some other Macs, the screen will turn white, black, or grey that one cannot tell if the Mac is switched on or not.

Alternatively, you may also find your Mac frozen on the installation page with a message saying, “macOS could not be installed on your computer.” And if you click the Restart button, the same message will show.

As you can see, your Mac has many ways of telling you that the installation of Mac OS has stalled. But before you take action, you have to be sure that the installation is no longer running in the background. Otherwise, you might lose your data when you interrupt the installation process with a forced reboot.

If you are uncertain whether or not your Mac has frozen during the installation, consider our advice below:

1. Know if your Mac has really stalled.

Before you come up with a conclusion that your Mac has stalled during the installation, you have to be aware of certain things.

Sometimes, the High Sierra installation can take very long to the point that it looks frozen already, but when you leave it for hours, the process has eventually completed. So, it’s best that you leave your Mac overnight to complete the installation.

Generally, the installation of the updates can take 16 hours or more, and the status bar you see during the installation is only a guess at how long the installation will take.

2. Check the Log to know if your Mac is still installing the update.

To bring up the Log, press the Command + L keys. It should show added information and details about the total time left for the installation. It will also give you a better idea of what files are currently being installed.

3. Be patient.

If you think that the installation has not stalled, just be patient and wait for the process to be completed for a few more hours.

Fixes to a Stuck Mac OS Sierra Installation

Once you have checked everything and you are positive that your Mac has completely stalled, follow these steps:

1. Restart your Mac.

Press and hold the Power button to switch off your Mac. Wait for a few seconds and restart your Mac.

2. Visit the Mac App Store.

If you obtained the updates from the Mac App Store, go to the App Store and check Updates. The update or installation process should commence from where it has ended.

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3. Check the Log.

Once the progress bar shows, open the Log by pressing the Command + L keys. It should show what files have been installed and what are pending. If the Log screen shows that there have been no updates, proceed to the next step.

4. Install the Combo update.

As mentioned above, the Mac App Store is not the only place to download the High Sierra update from. You can also download it from Apple’s website.

We highly suggest you get your update from Apple’s website if you are having problems with the installation. If you visit the website, you can find the Combo update, which contains all the files needed to update your OS. This update version will replace all your system files to ensure everything is up to date.

5. Install the update in Safe mode.

To install the High Sierra update in Safe mode, press the Power button and hold down the Shift key. Once your Mac has restarted, go to the App Store and install the update in Safe mode. Then, reboot.

6. Allocate more space.

One possible reason why the update failed is that there is not enough storage space available to perform the installation. While in Safe mode, you might as well start deleting some files.

7. Reset your NVRAM.

If the installation in Safe mode still does not work, reset your NVRAM. Restart your Mac and then hold down the Command, Option, R and P keys. That should reset the NVRAM. Wait for a few seconds until your Mac restarts and wait if the installation starts.

8. Start in Recovery mode to reinstall High Sierra.

You can also restart your Mac in Recovery mode by holding down the Command + R keys at startup. From here, you will be presented with a few options. But we suggest you select the Install new OS option.

While reinstalling your OS, your Mac will replace all the system files and overwrite the problematic ones which may cause the error.

9. Install High Sierra from an external drive.

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If you are still having problems with installing High Sierra, you can try installing it from an external drive.

10. Once everything is updated, run Disk Utility.

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After you have successfully installed High Sierra, we suggest you run Disk Utility to see and correct any issues that might have caused the installation problem. It’s also a great idea to install Mac repair app to ensure your Mac is optimized and free of junk files.

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Hopefully, we were able to give you answers and helped you fix your problems with a stuck Mac OS Sierra installation. If you have done all the steps above and you are still having installation issues, we suggest you take your Mac to the nearest Apple Store and have an Apple technician check it.