Downloading and installing macOS High Sierra (10.13) can be tricky because Apple no longer lists it directly in the App Store search. You can get the official full installer through the Apple Support page Microsoft Community Hub 1. Download the Full Installer Via Web Browser: this official link to open the hidden App Store page. Click to download the Install macOS High Sierra.app (approx. 5.2–7.7 GB) to your /Applications Via Terminal: If you are on macOS Catalina or later, run this command:
This guide provides a comprehensive walkthrough for downloading the , creating a bootable USB, and installing it safely. Why Install macOS High Sierra in 2026?
For Macs equipped with all-flash internal storage, High Sierra automatically converts the file system from HFS+ (Mac OS Extended) to APFS during installation. This conversion is automatic and nondestructive, but it means that once a Mac is upgraded to High Sierra, downgrading to an earlier macOS version becomes more complicated. macos high sierra download dmg install
If you are upgrading an existing macOS installation on a compatible Mac and you have downloaded the DMG file:
Select the volume using the arrow keys and press Enter . Format the Target Drive (Clean Install) Downloading and installing macOS High Sierra (10
It is highly recommended to download macOS installers directly from Apple to avoid corrupted files or malware. 1. Direct from the Mac App Store
Double-click the downloaded InstallUpgradableMacOSX.dmg file to mount it. Click to download the Install macOS High Sierra
This 2,500-word guide will walk you through every step: locating the authentic DMG, creating a bootable USB, and performing a pristine installation.
Once you have the bootable USB ready, follow these steps to install High Sierra: 1. Boot from the USB Shut down your Mac. Plug in the bootable USB drive. Turn on the Mac while holding down the key.