There are several reasons why you might want to download a macOS Sierra 10.12 DMG file:
Disconnect your Mac from the internet. Open Terminal before starting the installation and change the system clock to a date closer to Sierra's release lifecycle. Type date 0101100017 (January 1st, 2017) and press Enter . Close Terminal and restart the installer. Error: "An error occurred while preparing the installation" download macos sierra 1012 dmg file install
Apple officially offers the installer via a .pkg file which extracts the app. Official direct .dmg files are no longer provided, making the package installer method the only secure method. There are several reasons why you might want
Terminal will output progress bars ( 0%... 10%... 100% ). Do not close Terminal or unplug the drive until you see the message: "Copy complete. Done." Part 4: How to Install macOS Sierra Using the USB Drive Close Terminal and restart the installer
Yes. Sierra is a direct upgrade from OS X 10.11.
Clicking the link downloads a file named InstallOS.dmg . This container holds the actual macOS Sierra installer application. Step 2: Extract the Installer Application
Step 3: Create a Bootable macOS Sierra USB Installer (Recommended)