Mac os sierra free download - Apple MacOS Sierra, Apple MacOS High Sierra, R for Mac OS X, and many more programs.
You can upgrade to macOS Sierra from OS X Lion or later on any of the following Mac models. Your Mac also needs at least 2 GB of memory and 8.8 GB of available storage space.
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To find your Mac model, memory, storage space and macOS version, choose About This Mac from the Apple menu . If your Mac isn’t compatible with macOS Sierra, the installer will let you know.
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Find out how to back up your Mac.
It takes time to download and install macOS, so make sure you have a reliable internet connection. If you’re using a Mac notebook computer, plug it into an AC power source.
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
If you still need macOS Sierra, use this link: Download macOS Sierra. A file named InstallOS.dmg will be downloaded to your Mac.
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallOS.pkg.
Follow the on-screen instructions, which will guide you through the necessary steps to complete the installation.
After the installation has been completed, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.
Click Continue and follow the on-screen instructions. You may find it easiest to start installation in the evening so that it can be completed overnight, if needed.
Please allow the installation to be completed without putting your Mac to sleep or closing its lid. Your Mac may restart, display a progress bar or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.