Once the App Store loads the Sierra page, click the or Download button.
While free to download, remember that macOS Sierra (10.12) is an older OS.
Are you looking to perform a , an upgrade , or setting up a virtual machine ?
Once you have the installer in your Applications folder, the best way to install it is via a bootable USB. You'll need a drive with at least Connect your USB drive and rename it to (Applications > Utilities). Paste the following command and press Enter:
Leo clicked it. A simple, no-frills download window popped up. macOS_Sierra_10_12.dmg — 4.97 GB
To download macOS Sierra 10.12, follow these steps:
Before downloading and installing, ensure your hardware is fully compatible with macOS Sierra. Compatible Mac Models Late 2009 or newer MacBook Air: Late 2010 or newer MacBook Pro: Mid 2010 or newer Mac mini: Mid 2010 or newer iMac: Late 2009 or newer Mac Pro: Mid 2010 or newer Hardware Requirements Memory: Minimum 2 GB of RAM (4 GB recommended). Storage: At least 8.8 GB of available storage space.
This is a common error with older installers on newer macOS versions. The certificate used to sign the installer has likely expired. A common and safe workaround is to disconnect your Mac from the internet and then manually set the system date back to a time when the certificate was valid (e.g., in 2018) before running the installer.
To install macOS Sierra 10.12 from a DMG file:
Wait for the process to complete. Terminal will display "Done" when the bootable drive is ready. How to Install macOS Sierra from a Bootable USB
