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Choose if you are installing on a Solid State Drive (SSD).
Apple officially provides legacy versions of macOS through the Mac App Store and their support website.
Press the button while holding down the Option (Alt) key on your keyboard.
| Mac Type | Boot Method | |----------|-------------| | | Restart and immediately hold the Option (⌥) key until you see the startup manager, then select the USB drive | | Apple Silicon (M1/M2) Mac | Shut down, then press and hold the power button until you see startup options, then select the USB drive |
for offline deployment or troubleshooting multiple systems.
This will open the App Store. Click "Get" to download Install macOS High Sierra.app to your Applications folder. Method B: Third-Party DMG Download
Open the Applications folder and run .
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
High Sierra supports Macs from late 2009 (MacBook/iMac) or 2010 (Pro/Air/Mini) and newer.
Once your bootable drive is ready, follow these steps to install the OS:
Avoid third-party torrent sites or unverified file-sharing links, as they often contain bundled malware or corrupted installation files. Always use official Apple servers. Method A: Direct Apple Server Download (Recommended)
