Running macOS Sierra online is a security risk. Do not use it for banking, email, or daily browsing. Use only for offline projects, retro computing, or air-gapped legacy hardware.
macOS Sierra (version 10.12) is a legacy operating system released by Apple in 2016. While Apple no longer provides direct download links through official channels for newer hardware, a DMG (Disk Image) file can be obtained for installation on compatible older Macs. This report outlines the legitimate methods for downloading the macOS Sierra 10.12 DMG, prerequisites, and the step-by-step installation process. download macos sierra 1012 dmg file install
When downloading DMG files from the internet, be cautious. Running macOS Sierra online is a security risk
Use this if you need to wipe your drive or install Sierra on a different Mac. Apple Support Prepare USB : Connect a USB flash drive (at least 12GB) and use Disk Utility to format it as Mac OS Extended (Journaled) with the name Run Terminal Command : Open Terminal and paste the following command: macOS Sierra (version 10
This does install the OS; it extracts the "Install macOS Sierra" application into your Applications folder. Creating a Bootable USB Installer