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command in Terminal to build the bootable drive once the installer application is moved to the /Applications 3. Compatibility & Support Status Supported Systems

Surprisingly, Apple’s Content Delivery Network (CDN) still hosts the full Sierra installer. You can trigger the download using a legitimate Apple URL. download macos 1012 sierra full

This doesn't install the OS; it extracts the "Install macOS Sierra" app into your Applications folder 4. Creating Bootable Media command in Terminal to build the bootable drive

Tell me if you need help to confirm compatibility. macOS Sierra (10.12.6) Download - Apple Support Community download macos 1012 sierra full

Because Sierra is 10 years old, hackers sometimes inject malware into old OS downloads. Always verify the SHA-1 checksum before installing.