If your hardware supports it (Macs from 2012 or later), upgrading to a newer OS like macOS Catalina or Monterey is highly recommended for security. High Sierra should only be used on air-gapped machines (computers not connected to the internet) or for specific legacy software that cannot run on newer systems.
Exit Disk Utility and select Install macOS . Follow the on-screen prompts to complete the setup. Troubleshooting Common Issues
Select your internal hard drive (e.g., Macintosh HD ) and click . Choose APFS if your Mac has an SSD.
Apple provides download links for older macOS versions like Sierra and High Sierra as DMG files.
This guide provides a comprehensive, step-by-step walkthrough to safely download the official macOS High Sierra 10.13.6 DMG file, create a bootable USB installer, and execute a flawless clean installation. Prerequisites: Check Compatibility and Back Up macos high sierra 10136 dmg install
Use the arrow keys to select and press Enter .
The last OS to support many 32-bit applications that were later phased out in macOS Catalina.
on the USB drive, as this process erases it entirely. Format the USB Drive Open Disk Utility (Finder > Applications > Utilities). Connect your USB drive.
.badge background: rgba(255,255,255,0.2); padding: 0.3rem 1rem; border-radius: 30px; font-size: 0.85rem; display: inline-block; margin-bottom: 1rem; If your hardware supports it (Macs from 2012
Set up testing environments in software like VMware, VirtualBox, or Parallels. Hardware Compatibility Checklist
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled Use code with caution.
Plug the bootable High Sierra USB installer into the machine.
iBoysoft DiskGeeker is a third-party utility that can download the official macOS High Sierra DMG directly from Apple‘s servers. This is especially useful if the App Store method gives you a compatibility error on a newer Mac. Follow the on-screen prompts to complete the setup
It finalized the APFS (Apple File System) adoption.
With your bootable USB drive ready, you can now proceed to install the operating system. Case 1: Clean Installation (Erasure of existing data) Turn off the target Mac entirely. Insert your bootable High Sierra USB drive.
Once the media is ready, the installation process follows these steps:
Wait for the process to reach 100%. Terminal will display "Copy complete" when the bootable drive is ready. Step 3: Installing macOS High Sierra 10.13.6