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
IPhone and Mac sales are way up from the start of the pandemic. Meanwhile, Apple's crucial Services business hit another all-time high. Velazco, 18 hours ago. Twitter Facebook Reddit Mail. Explore the world of Mac. Check out MacBook Pro, MacBook Air, iMac, Mac mini, and more. Visit the Apple site to learn, buy, and get support.
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.
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- macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks
- macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
- macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion
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.
- macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion
- OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion, or Snow Leopard
- OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion, or Snow Leopard
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.
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.
Learn more
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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.
Joy for Mac OS X, the developer productivity and RAD tool by AAA+ Software, has been updated and now offers full support for the new Mac OS X Project Builder, as well as a less obtrusive registration reminder.
Joy provides a path for developers to learn Cocoa, Apple's object oriented development environment. You can use Joy's runtime class browser and object inspector to debug your own programs, or even to inspect Cocoa applications you don't have the source code for, according to MacTech magazine. The built-in scripting language (syntactically compatible with Objective-C and JavaScript) can be used to send messages to any object and to teach new methods.
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Developers can also call Carbon API and Java methods interactively from the Joy command window. Plus, the tool can be used with Apple's Interface Builder to develop standalone Mac OS X applications.
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Joy is available for Mac OS X, Mac OS X Server and OPENSTEP. It can be downloaded from the AAA+ Web site. Use of the software is free for evaluation purposes. A free unlock code can be ordered by e-mail, with the response being sent by AAA+'s automated servers in minutes. Regular licenses are US$69 for users who develop only small-scale applications, and $399 for unlimited use. Registered users can upgrade to Joy 2.3 for Mac OS X free of charge.
