MacOS Sierra (version 10.12) is the thirteenth major release of macOS (previously known as OS X and Mac OS X), Apple Inc.' S desktop and server operating system for Macintosh computers. The name 'macOS' stems from the intention to uniform the operating system's name with that of iOS, watchOS and tvOS. Sierra is named after the Sierra Nevada mountain range in California and Nevada. Yosemite was released in fall of 2014, El Capitan was released during fall of 2015, and Sierra was released during fall of 2016. Other than the new Siri voice assistant in Sierra, most other notable changes require another device or a paid service such as iCloud and Apple Music.
Restart your mac. As it restarts, hold down the Command and R keys together until the Apple logo appears. After a while, you'll see a screen that offers a few choices (Disk Utility, Reinstall OS, etc.). Click on Reinstall OS, and choose Yosemite. If you have access to a Mac running OS X Yosemite or older it is possible to see old versions of Mac OS X in the Mac App Store. Yosemite, Mavericks and Mountain Lion can all be seen here.
To 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.
Find out how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
If a macOS installer can't be used on your Mac, the installer will let you know. For example, it may say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation. Hp photosmart printer driver for mac.
Before proceeding to answer, Apple changed the operating system prefix from Mac OS X to macOS. The name change is similar to the mobile operating system name change from Phone OS to iOS many years ago (starting with iOS 4 in 2010). Yosemite was released in fall of 2014, El Capitan was released during fall of 2015, and Sierra was released during fall of 2016.
To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini or Mac Pro.
Make a backup
Before installing, 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.
Download macOS
It takes time to download and install macOS, so make sure you're plugged into AC power and have a reliable Internet connection.
Safari uses these links to find the old installers in the App Store. After being downloaded from the App Store, the installer opens automatically.
MAC OS X Yosemite – Upgrade To High Sierra Instructions ..
Safari 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 start installing the operating system.
Install macOS
Follow the onscreen instructions in the installer. It may be easiest to start the installation in the evening so that it can be completed 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 the installation to finish without putting your Mac to sleep or closing its lid. Your Mac may restart, show a progress bar or show a blank screen several times while macOS and related firmware updates are being installed.
Learn moreMacOS Version History - Wikipedia
You may 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.
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