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Upgrade Install: This is the most common type of installation. You can find out more about performing a clean install with the guide:

The advantage is the ability of a clean install to let you start over, just as if you had just turned your Mac on for the first time. The clean install process includes erasing the Mac’s startup drive or the selected destination drive, removing any data it may have held, likely including all of your user data and applications. 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. With its “Junk Files” feature, it not only cleans temporary files including logs, mail caches, iTunes, and iOS temporary files, and empties trash for the current user, but also detects remaining files after deleting apps.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. It’s really great to have such a system optimizing tool. I must tell you there is a savior for your Mac – Cleaner One Pro. There are also probably many apps you have never used and don’t need anymore. Let’s say someday your Mac has a lot of junk files and duplicate photos. I believe you also want to keep your Mac clean. If you have done a complete installation of macOS, you must be enjoying the completely new macOS now. Click “Install” and wait until the upgrade is done Agree to the software terms and conditions.

When the installation window appears, click “Continue” again. When it returns to the former page, insert your USB and click “Continue”. Select “Mac OS Extended (Journaled)” from the list of volume formats and start formatting.į.

Open “Disk Utility”, choose your startup disk, and then click “Erase”.Į. Press and hold “Command+R” when you hear a startup ring (or when the screen on your newer Mac device turns black), and hold down the keys until your computer restarts.ĭ.