Install High Sierra From Usb Windows

What’s up guys, in this tutorial I’m going to show you How to Create Bootable USB Installer for macOS High Sierra Windows 10 Operating System. There are few applications that you need to download in-order to successfully create a bootable USB Flash Drive to install macOS High Sierra Windows 10 PC.

Firstly, you need to download TransMac application as we will use this to write files onto flash drive. Once you have downloaded and installed TransMac, run the application.
TransMac is a Paid Application. But the trial period will last for 15 days, this is more than enough for us to Create Bootable USB Installer for macOS High Sierra Windows 10.
Before you click Run, just make sure you have plugged-in your 16 GB USB Flash Drive.
Now, Click Run and proceed with the trial of 15 Days. You should see the following screen once you click Run.

I installed High Sierra on an external disk tonight from my Macbook Pro which is running El Capitan. Going to try to use the HS disk utility on the external to reformat the SSD directly to APFS, and then try to install HS again on my Mac Pro. Download the official macOS High Sierra installation package. It is recommended to download it from the App Store. Put the keyword “High Sierra” directly into the search bar in the App Store. The whole installation package size is about 5GB, so it might take a while to download.


Right-Click on your USB Flash Drive and select the option Format Disk for Mac.
When the warning pops-up click Yes.
TransMac will now ask you to name your ISB Drive. I will name my USB Drive as “USB InstallerSierra“, but you can name it anything you like. After you Name the USB Drive click OK.
Click Yes, when TransMac will give you the Overwrite warning.

Now, just wait for few moments, as the formatting process is going on.


Once the formatting is successfully completed you should get this following confirmation. If it is not a success, please follow the steps again and format your flash drive.
Click Ok, and now right-click on your USB Flash Drive again and select the option Restore with Disk Image.
Click Yes, when TransMac gives you a warning for Overwriting.Next Step is to Select the dmg file for macOS High Sierra. You would need an Mac to download the macOS High Sierra Installation file from Apple Store.
To locate the DMG File, follow these steps
After you have downloaded the High Sierra app, locate the InstallESD.DMG from the installer.

In Applications folder: Right-click on Install MacOS High Sierra app, then choose Show Packages Contents to reveal Contents folder.

The MacOS High Sierra InstallESD.DMG is found under: Contents/SharedSupport/

Now copy this InstallESD.DMG as you need it in TransMac to Create macOS High Sierra Bootable USB Installer on Windows 10.

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Ok, so lets continue with TransMac Restore Disk Image to Drive. On this screen, select the InstallESD.DMG file and click OK.
Click Yes, when TransMac Gives you the Overwrite warning.
Now the TransMac will start the process of Restoring High Sierra Image on the Flash Drive. this will take 15-25 minutes, depending on the speed of your flash drive.


Ok that should be it for this tutorial on How to Create macOS High Sierra Bootable USB Installer on Windows 10 PC.

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Now that you've finished setting up OpenCore, you're finally able to boot, main things to keep in mind:

  • Enable BIOS settings optimal for macOS
  • Read up on the Multiboot Guide(opens new window) and look at Multiboot(opens new window) specific quirks
    • Mainly relevant for those running a single drive for multiple OSes
  • And a copy of the General Troubleshooting page
  • Read up on the macOS Boot Process
    • Can help first time installers better understand where they may be getting stuck
  • And a ton of patience

# Double checking your work

One last thing we should go over before booting is how your EFI is setup:

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Good EFIBad EFI
EFI folder found on EFI partitionEFI folder missing
ACPI Files are compiled(.aml)ACPI Files are not compiled(.dsl)
DSDT is not included* DSDT is included
Removed unneeded Drivers(.efi)Leaves default Drivers
Removed unneeded Tools(.efi)Leaves default Tools
All files in the Kexts folder end in .kextIncludes source code and folders
config.plist found under EFI/OCNeither renamed or placed the .plist in right location
Only uses kexts that are neededDownloaded every kext listed

And a reminder that slowgeek site is your friend:

# Booting the OpenCore USB

So you're now ready to finally put the USB stick into your computer and boot off of it. Remember that most laptops and some desktops will still default to the internal drive with Windows, and you'll need to manually select OpenCore in the BIOS boot options. You'll need to check in the user manual or use a bit of google to find out what Fn key accesses the BIOS and boot menu(ie. Esc, F2, F10 or F12)

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Once you boot the USB, you'll likely be greeted to the following boot options:

  1. Windows
  2. macOS Base System (External) / Install macOS Catalina (External)
  3. OpenShell.efi
  4. Reset NVRAM

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For us, Option 2. is the one we want. Depending how the installer was made, it may report as either 'macOS Base System (External)' if created in Linux or Windows and 'Install macOS Catalina (External)' if created in macOS.

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# macOS Installer

So you've finally got the installer booted, got through the verbose and hit the installer! Now that you've gotten this far, the main things to keep in mind:

  • Drives you wish to install macOS on must be both of GUID partition Scheme and APFS
    • High Sierra on HDD and all Sierra users will need to use macOS Journaled(HFS+)
  • The drive must also have a 200MB partition
    • By default, macOS will setup freshly formatted drives with 200MB
    • See the Multiboot Guide(opens new window) for more info on partitioning a Windows Drive

Once you start the installation, you will want to wait until the system restarts. You will once again want to boot into OpenCore, but rather than selecting your USB installer/recovery - you will want to select the macOS installer on the hard drive to continue installation. You should get an apple logo, and after a few minutes you should get a timer at the bottom saying 'x minutes remaining'. This may be a good time to get a drink or snack as this will take a while. It may restart a couple more times, but if all goes well, it should finally plop you at the 'Setup your Mac screen'

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You're in! 🎉You will want to go through the Post-Installation pages to finish setting up your system.