MacOS Catalina is not compatible with Apple silicon. Your USB stick or external hard drive is now a bootable Catalina installer, so keep it safe. Now, it’s time to clean install macOS Catalina. Once you see ‘Done’ in Terminal, you can quit it. Press Return and wait for the word Done to appear in Terminal.Type: sudo /Applications/Install\ macOS\ Catalina\ Beta.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ macOS\ Catalina\ Beta.app where ‘Untitled’ is the name of your USB stick or external hard drive.Launch Terminal from Applications>Utilities.However, if you’re comfortable using Terminal, you can do it like this: The easiest method for creating a bootable installer is to use DiskMaker X.Launch Disk Utilities and Erase the Drive or USB stick, formatting it as Mac OS Extended (Journaled) or APFS and selecting GUID partition map if a selection is available.Go to Applications > Utilities and launch Disk Utility.Grab a USB stick with a capacity of at least 16GB or an external hard drive.If you’re clean installing the beta (and, by the way, that’s not something I would recommend), it’s much better to create a dual boot system when you run the beta. If you’re reading this, you can download macOS Catalina from the Mac App Store, as it has shipped already, and then choose Quit when the installation starts. Create a bootable installer of macOS Catalina You can use Apple’s Notes app to make notes, as long as you sync them with iCloud. And you should make sure you have a copy of any license codes that you’ll need when you reinstall applications. You should also make notes of settings for apps you regularly use - screen grabbing them is a good way to do that. Just make sure you have a complete, preferably bootable, copy of your current installation. You can use Time Machine, another backup app, or a cloning tool. You’re going to be erasing your startup drive completely, so you need a complete backup of everything. You must back up your Mac before you do anything else. When it’s finished, either press Remove to get rid of all the files it recommends or choose Review to look through what it’s found and decide for yourself what to delete and what to keep.Download and install CleanMyMac - try a free edition of the app here.You can expect to free up tens of gigabytes of space, including old apps and their leftovers. There are many free and paid tools to clean junk, but the quickest option is to run CleanMyMac X. Tip: Clear out the junk before installation.īefore the clean installation of macOS 10.15 Catalina, it’s recommended that you first delete junk and dusty files from the current macOS.
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