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15 Février 2021
Before installing this upgrade, make sure that your Mac is ready.
Apple has the final word on the support life cycle for a given OS X release. Attempting to extrapolate from past Apple support behavior, or other patterns is mere speculationabout future support commitment intervals. Mac OS X 10.6 Snow Leopard was the first version of OS X to be built exclusively for Intel Macs, and the final release with 32-bit Intel Mac support. Chances are, your Mac can run macOS Big Sur. The following models are supported: MacBook (2015 or later) MacBook Air (2013 or later) MacBook Pro (Late 2013 or later) Mac mini (2014 or later) iMac (2014 or later) iMac Pro (2017 or later) Mac Pro (2013 or later) To see which model you have, click the Apple icon in your menu bar and choose About.
macOS Big Sur supports most Mac models introduced in 2013 and later.
View compatible Mac modelsBefore you upgrade, make a complete backup with Time Machine, or store your files in iCloud.
Learn how to back up your MacIf the installer needs more storage space to upgrade, you can free up space using tools that come with your Mac.
Free up storage spaceIf you're using macOS Mojave or later, choose Apple menu > System Preferences, then click Software Update. If you're using an earlier macOS, use the App Store instead.
Learn about some of the new features of macOS Big Sur.
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Get supportTo get the latest features and maintain the security, stability, compatibility, and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Learn how to upgrade to macOS Big Sur, the latest version of macOS.
If a macOS installer can't be used on your Mac, the installer will let you know. For example, it might say that your Mac doesn't have enough free storage space for the installation, or that the installer is too old to be opened on this version of macOS.
If you want to check compatibility before downloading the installer, learn about the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan, or Yosemite. You can also check compatible operating systems on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini, or Mac Pro.
Before installing, it's a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
It takes time to download and install macOS, so make sure that you're plugged into AC power and have a reliable internet connection.
These installers from the App Store open automatically after you download them:
Your web browser downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to begin installing the operating system.
Follow the onscreen instructions in the installer. It might be easiest to begin installation in the evening so that it can complete overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
You might also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.
