Click the 'Start Your Enrollment' to begin and then follow the instructions. You'll need an Apple ID, and provide your basic personal information. If you’re not currently enrolled, then go to the Apple Developer Program enrollment webpage, which will show you everything you need to sign up. To do that, you need to be enrolled in the Apple Developer Program. Once you've downloaded macOS 11 Big Sur, you might want to play with the more cutting edge developments in the OS that aren't available to the public yet.
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How to enroll in the Apple Developer Program
For information on how to do this, head over to our ultimate guide to backing up your Mac. Whenever you upgrade your operating system we highly recommend backing up the files on your Mac, so if anything goes wrong you can quickly restore your machine to its previous working order.īefore you download and install macOS 11 Big Sur, make sure your Mac is backed up.
If you try to install a macOS that is older than the version currently installed, the installer will say that it is too old to be opened on this version of macOS. If a macOS isn't compatible with your device, the App Store or installer will let you know. It will always give you the best, most recent version. For example, if your Mac came with macOS Big Sur, it can't use macOS Catalina or earlier. One of the best aspects of owning a Mac is the great upgrade system it is. Home / Extra Tools / How to Download & Install Old Versions of Mac OS X. MacOS 9 was abandoned in favor of of the Unix-ish NextStep/Openstep based Mac OS X. How to Download & Install Old Versions of Mac OS X. Like previous version, it lacks true protected memory or pre-emptive multitasking. (Image credit: Apple) Back up your Mac before upgrading to macOS 11 Big Sur Mac OS 9.x, based on Mac OS 8 was the final product based on the classic MacOS architecture.
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