Apple provides direct, legitimate methods to obtain legacy macOS versions safely. Method 1: Direct Download from Apple Support (Recommended)
Copy and paste the following official Apple command into the Terminal window: Download Mac Os Sierra 10.12 Dmg
sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraUSB --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction Apple provides direct, legitimate methods to obtain legacy