Download Macos 1012 Sierra Full [new] Jun 2026

Note: You must perform this extraction process on a compatible Mac running a version of macOS that can read the package file. Method 2: Download Using the Mac App Store

Sierra was

Set the Format to and the Scheme to GUID Partition Map . Click Erase . Once formatting is complete, open Terminal .

Apple hosts direct links for legacy operating systems outside of the traditional Software Update panel. Use one of the two verified primary channels detailed below. Method A: Direct Web Browser Download (Recommended) download macos 1012 sierra full

Released in 2016, Sierra’s primary contribution was the integration of

: Navigate to the Apple Support macOS Download Portal and click the Sierra 10.12 hyperlink to download the InstallOS.dmg file directly to your Downloads folder.

softwareupdate --fetch-full-installer --full-installer-version 10.12.6 Note: You must perform this extraction process on

If you have previously "purchased" or downloaded Sierra using your Apple ID, it may still appear in your Purchased tab within the Mac App Store. System Requirements for macOS Sierra

Open your web browser and navigate to the official Apple Support page for older macOS versions. Locate the section.

Type the following command exactly as shown and press Enter: softwareupdate --fetch-full-installer --full-installer-version 10.12.6 Once formatting is complete, open Terminal

Method 1: Download macOS Sierra Directly via Apple (Recommended)

Type date 0920170016 and press . This changes your system clock to September 20, 2016, a date when the certificate was still valid. Quit Terminal and attempt the installation again. "An error occurred while preparing the installation"

Are you installing this on a or a PC (Hackintosh) ?

Select your USB drive from the left sidebar. Click at the top.

Plug in a USB flash drive with a capacity of at least . Open Disk Utility (Finder > Applications > Utilities). Select your USB drive from the left sidebar. Click Erase at the top. Name the drive SierraInstaller . Set the Format to Mac OS Extended (Journaled) . Set the Scheme to GUID Partition Map . Click Erase to format the drive. Run the Terminal Command Open Terminal (Finder > Applications > Utilities). Copy and paste the following command exactly as written: