• 4.0 out of 5 stars

    For people with older Macs than Sierra, this is the only available option

    Apple Support Communities user tip 3761 describes in more detail upgrade options for Mountain Lion. People with Mountain Lion compatibility, but not Mac OS Sierra compatibility, can upgrade to 10.9, 10.10, 10.11 if they can get the Mac App Store to release one of them for download, and then go up to 10.9.5, 10.10.5, or 10.11.6 to receive the latest security updates for the particular operating system. If you already downloaded 10.9, 10.10, or 10.11 before they were discontinued, the download history of the App Store should allow you to redownload it. Overall, a good system if your software is only compatible with it. Newer operating systems may add newer features, but you should check if those features are worthwhile. Do not upgrade if you have a slow or crashing Mac, and always backup your data before installing anything new. Crashing and slowness usually indicate something not compatible is installed, a directory issue, or a hardware issue.

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