It might also be a challenge to request that download from a machine that Apple is no longer supporting or if you want to use the AppStore and have not previously downloaded the installer with the AppleID currently in use. Sierra is not officially supported on that machine you have now. Once that is downloaded or came otherwise into your possession in full then the app is transferable to other Macs.įor the actual install it is possible to create a real external install medium, most users opt for a USB-stick.Īn application that greatly simplifies the task is DiskMakerX. But you need access to an ***Install.app that is usually downloaded via the AppStore. To install any version of OS X/macOS it is strictly speaking not necessary to provide or even have an AppleID. That translate into version numbers as anything from 10.5.7 (9J3050) to 10.11 (and with caveats: also 10.12) can be installed. This 2009 MacBook Pro should be able to boot anything from Leopard, Snow Leopard, Yosemite to Sierra. Just to clarify the terminology used: If you ask about "reinstall macOS" that would mean macOS "Sierra", at least, strictly speaking, older versions of the Macintosh operating system are called Mac OS X.
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