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Open the downloaded .dmg file and run the package inside to extract the actual Install macOS Sierra.app into your Applications folder. Method 2: Use the macOS Terminal
Downloading operating system installers from torrent sites, file-sharing blogs, or unofficial forums exposes your computer and personal data to severe vulnerabilities. 1. Malware and Spyware Injection
Open and execute the official Apple creation command:
If you or your Apple ID downloaded Sierra in the past when it was current, you can go to the “Purchased” tab in the Mac App Store and re‑download the installer. However, given that Sierra is no longer listed prominently, this method is less reliable than the direct CDN method.
Pre-installed bootloaders for non-Apple hardware (Hackintosh).
allows you to download verified macOS installers directly from Apple's SUS (Software Update Service). How to Use the Downloaded DMG Once you have the InstallOS.dmg
Then look for — it redirects to the App Store. If you see an error, use this direct macappstores link:
Do not run the .pkg file on your current Mac if you are trying to make a clean installer or if your Mac is "newer" than the OS. Running it might try to install the OS over your current system. Instead:
With your bootable drive ready, you can now install the operating system. Turn off the Mac you want to update. Plug in the bootable USB drive. Turn on the Mac while holding down the key. Release the key when you see the Startup Manager screen. Select the USB installer and press Enter.
To download a clean copy of the final release of macOS Sierra, bypass unofficial mirrors and open the Official Apple macOS Download Link directly in Safari. 2. Extracting the Installer App