Follow the prompts to begin the installation, which will restart your Mac. Scenario 2: Clean Install (Recommended) A clean install is better for fixing performance issues. Download the Install macOS High Sierra.app .
Open the Applications folder and run .
A: Yes, but you must perform a :
Re-enable it after installation with sudo spctl --master-enable macos high sierra download dmg install
This usually indicates a corrupted download or a faulty USB drive.
Good luck, and enjoy your freshly installed macOS High Sierra system!
: This is often due to an expired certificate. To fix it, disconnect from Wi-Fi, open Terminal in the recovery environment, and set your system date to a time closer to 2017 (e.g., date 0101010117 ). Follow the prompts to begin the installation, which
Quit Terminal and restart the installation
using software like VirtualBox, VMware, or Parallels on Windows or Linux. System Requirements for macOS High Sierra
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build Use code with caution. Open the Applications folder and run
A: From bootable USB to complete setup: approximately , depending on:
Use Apple’s built-in creation tool to populate the image with the High Sierra installer files:
This comprehensive guide will walk you through the entire process, from securely sourcing the macOS High Sierra DMG to creating a bootable installer and executing a clean setup. 1. System Requirements for macOS High Sierra