Obtaining operating system files from unverified third-party websites exposes your system to malware and altered system files. Always prioritize official channels. Method A: Download via the Mac App Store (Recommended)
Once finished, click install if the prompt opens automatically. Close the installer window. The file named Install macOS High Sierra.app will now sit safely inside your /Applications folder. Method B: Extracting the DMG/PKG via Terminal
Open (Press Command + Space , type "Disk Utility", and hit Enter). Select your USB drive from the left sidebar. macos high sierra 10136 dmg install
Select the root internal drive (the very top item of your internal tree structure, often named "Apple SSD..." or "Macintosh HD"). Click the button at the top toolbar. Configure the format settings based on your drive type: Name: Macintosh HD
Open your web browser and visit the official Apple Support page for older macOS versions. Close the installer window
Even though 10.13.6 is final, Apple released several “Security Updates” (2020-005, 2020-006). Go to App Store > Updates.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Select your USB drive from the left sidebar
Before altering your operating system, verify that your hardware is supported and your personal data is securely backed up. 1. Hardware Compatibility macOS High Sierra supports the following Mac models: Late 2009 or newer MacBook Air: Late 2010 or newer MacBook Pro: Mid 2010 or newer Mac mini: Mid 2010 or newer iMac: Late 2009 or newer Mac Pro: Mid 2010 or newer 2. System Requirements
This standard error happens because Apple's security certificates for older installers expire over time. To fix this, disconnect your Mac from the internet, open Terminal during the installer boot screen, and change your system clock to an older date by typing date 0101100018 (January 1st, 2018) and hitting Enter. Quit Terminal and retry the installation.
You need a DMG installer of 10.13.6 if your Mac falls into the following range: