You might be aware that Apple's current Mac operating system is based on UNIX.but the company's history with the platform goes back farther than you might.
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.
Learn 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 might 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.
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. Learn how to back up your Mac.
Download macOS
It takes time to download and install macOS, so make sure that 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 downloading from the App Store, the installer opens automatically.
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 begin installing the operating system.
Install macOS
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.
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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 macOS and related firmware updates.
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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.
A developer was able to start up the nearly 20-year-old Mac OS 7.5.5 (née System 7) onto his Apple Watch running the latest WatchOS 2 update, exemplifying the extent to which computing has evolved over the past two decades. Race against ferrum gigantes mac os.
Enlisting the help of Mini vMac, Developer Nick Lee was able to get Mac OS 7.5.5 up and running on his Apple Watch loaded with Apple's latest watchOS 2 software.
The impressive feat, first spotted by MacRumors, is accomplished entirely on Apple Watch with relatively snappy performance despite what is today considered a low-power system-in-package design.
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Along with raw processing power, Apple's S1 integrated chip design packs in a full communications array including Wi-Fi and Bluetooth technology, NFC hardware, accelerometer, audio package, touch controller, wireless induction controller and more.
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When it first launched in 1991, Mac OS 7 ran on certain Macintosh Quadra series or then-current PowerBook models. By the time version 7.5.5 debuted in 1996, the operating system required a Power Macintosh 5500 to function effectively, which is decidedly less portable than Apple Watch.
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