![]() The same installer is used for both types but the steps involved are a bit different for each.Ĭlean Install: This type of installation is used when you want to completely remove all traces of a previous version of the OS. Like most versions of the Mac OS, Catalina allows you to perform two types of installs: an upgrade install and a clean install. To see what version of macOS you are running you can read my article about that.In this Rocket Yard guide we’re going to exam the two primary ways you can install macOS Catalina, as well as the preparations you should make before you update your Mac. MacOS 10.12 Sierra will stop receiving security patches in a few months, and older software has already stopped getting patches as well. I recommend going through the same process above first, however, removing the “Install macOS High Sierra” app and downloading it again to make sure you are beginning with the final release of High Sierra. High Sierra will receive security patches until the fall of next year (2020). If for some reason you have software that won’t run on Mojave or hardware that isn’t compatible, you can still upgrade to last year’s software, macOS 10.13 High Sierra. Once the installation begins you won’t be able to use your computer for an hour or two, during which you should leave it connected to power with the lid open if it’s a laptop computer. Depending on the speed of your internet it could take a few minutes to start the installer (if on cable) or a day (if you’re on DSL). Go back to the Mac App Store (Apple menu > App Store) and search for Mojave (or use the link below).Empty your trash by clicking and holding the Trash icon on your Dock. ![]() If you see any other “Install macOS” such-and-such programs that you don’t want anymore go ahead and delete those as well as they are enormous files.Put it in the trash by dragging it to the trash, pressing Command-Delete, or by clicking the “File” menu or the Gear icon > “Move to Trash” Locate “Install macOS Mojave” and click it once to highlight it. ![]() Depending on your customizations everyone may be used to going in a different way but the one way that will work for everyone is to click the “Go” menu and choose “Applications”
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