And while installation time has remained relatively consistent at anywhere from 20 to 50 minutes, the upgrade process is still lengthy. First, you have to start by cleaning up the junk file of your Mac. If you have ever installed that version on your Mac, no matter what version (or no version) is currently installed, you have these options. Today, it takes 3x longer to download an installer and 3x more space to store on Mac endpoints plus 3x more working disk space to run. This guide article shows you how to update and reinstall the macOS Sierra without losing data. However, you have other keystroke options depending on which version was previously installed.Īpple changed the start keys with macOS Sierra version 10.12.4. Mac OS users who want to install OS X 10.10 Yosemite on their machines and are facing issues installing the operating system for the first time on their Macs can follow a simple step-by-step guide. (If your main macOS partition had system files become damaged or missing, your other files will remain intact, as this reinstallation only installs and replaces system files and apps.)Ĭommand-R should reinstall the latest version of macOS that you had previously installed on this computer. When complete, it should reinstall macOS Recovery and reinstall macOS on the main partition. You should then be prompted to connect to a Wi-Fi network, and you enter a password.Īt this point, the Mac should start to download the recovery files from the internet and show a status bar. ![]() The Mac should recognize that there’s no macOS Recovery partition installed, show a spinning globe. Start up your Mac from a shut down state or restart it, then immediately hold down Command-R.
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