Download Macos Sierra 1012 Dmg File Install [repack] Page

Once the "Install macOS Sierra" app is in your Applications folder:

like the "valid mount point" issue that often occurs with older installers? How to download and install macOS - Apple Support

Select (or Reinstall macOS ) from the main utilities menu. Click Continue and agree to the software license terms.

Clicking the link downloads a file named InstallOS.dmg . This container holds the actual macOS Sierra installer application. Step 2: Extract the Installer Application download macos sierra 1012 dmg file install

Once you have your installer ready (either on a USB stick or a mounted DMG), follow these steps to install:

Press the button to turn on the Mac, and immediately press and hold the Option (Alt) key.

Type the following command to reset the system date back to a point when the certificate was still valid (e.g., January 1, 2017): date 010100002017 Use code with caution. Once the "Install macOS Sierra" app is in

If you'd like to narrow down these steps for your setup, let me know:

Open the system application ( /Applications/Utilities/Terminal ).

This is the most frequent roadblock users face when deploying older versions of macOS. It happens because the digital security certificates embedded within the 2016 installer file have since expired. Clicking the link downloads a file named InstallOS

Re-verify your USB drive name in Disk Utility. If it does not match SierraInstaller , rename the drive or modify the /Volumes/SierraInstaller portion of the Terminal command to match your drive name.

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraUSB --applicationpath /Applications/Install\ macOS\ Sierra.app Use code with caution. Press .

When the macOS Utilities window appears, select and click Continue .

Terminal will copy the files to your USB drive. This process usually takes between 15 to 45 minutes depending on your USB drive speed. Do not close Terminal until you see the message: Copy complete. Done. Part 5: Installing macOS Sierra 10.12