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![]() If a new version of macOS might make performance significantly worse, Apple could decide to drop support for that model. Apple doesn't share why it decides to exclude a Mac from a major release, but performance likely plays a big part in the decision. The process of upgrading your computer varies depending on which version of macOS is currently installed on your computer and how the computer is managed. Option 2: Install an Unsupported macOS Release Anyway. If this is the case, you will need to replace your current computer with a newer model. The Mac App Store will be your main way to download macOS. Unable to find it in the App Store, which directs you to Catalina and does not show an option to find High Sierra. If your computer does not meet the minimum requirements for Big Sur, you will not be able to install a supported version of macOS. Unable to find macos High Sierra download link in site Inherited an iMacPro mid2011 with MacOS Yosemited, for which the apple website indicates that High Sierra is the highest macos version that can be installed. The name 'High Sierra' refers to the High Sierra region in California. macOS High Sierra was announced at the WWDC 2017 on Jand was released on September 25, 2017. If you are running an older OS, you can look at the hardware requirements for the currently supported versions of macOS to see if your computer is capable of running them: Please re-install the latest XQuartz X11 release for Leopard after installing a system software update to OS X 10.5.x Leopard. macOS High Sierra (version 10.13) is the fourteenth major release of macOS, Apple Inc.s desktop operating system for Macintosh computers. If your computer is running macOS 10.15 Catalina or older it will need to be upgraded or replaced – make a note of your installed macOS version and your computer’s model and year as that information will be helpful when upgrading macOS. You can now copy this file to another Mac to install the latest version of High Sierra or create a bootable High Sierra installer using a USB drive. Assuming you see the macOS update, the process to download it works as follows: Click on Upgrade Now to download the installer for the new version of macOS.You’ll see the macOS name and version number (“macOS Catalina version 10.15.5” in the example below, which is too old) as well as your computer model and year.From the Apple menu in the top left corner of your screen, choose About This Mac.All UVM-owned computers running macOS 10.15 Catalina or older must be updated or replaced as soon as possible to comply with the University Information Security Policy.
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