Despite the age of the software, Apple maintains direct-download links for legacy operating systems. When you download Sierra from this official source, Safari will retrieve a disk image specifically named InstallOS.dmg .
Disconnect your Mac from the internet. Open Terminal from the Utilities menu in the installer menu bar. Change your system clock back to a date close to the operating system's release era by typing date 0101100017 (representing January 1, 2017) and pressing Enter. Quit Terminal and restart the installation process. The Installer Fails to Download via App Store Download Mac Os Sierra 10.12 Dmg
The system will open the Software Update panel or download the "Install macOS Sierra" application directly into your /Applications folder. Hardware Compatibility for macOS Sierra Despite the age of the software, Apple maintains