Step 1: Create a Bootable Installer with Terminal The process to clean install macOS Catalina can be divided into two parts – firstly we will create a bootable media for it and later would use the same to install macOS. If you don't want to lose your data, then take its extensive backup beforehand.You should have a USB drive or an external hard disk with at least 16 GB of free storage.The entire process would take at least 1-2 hours.Therefore, you should know these things in advance: Kindly note that a fresh installation of macOS would remove all the existing data, apps, or saved settings from your system. In this case, you can perform a clean installation of macOS Catalina 10.15 from scratch. If your Mac has inherited some problems, then an upgrade won't be able to fix it. The macOS Catalina upgrade would retain the user data, apps, third-party app data, and so on. Part 3: How to Clean Install macOS Catalina 10.15Īpart from just upgrading macOS on their system, some users choose to perform a clean install instead. You can follow the simple on-screen instructions afterward to complete the macOS Catalina installation. This will download the macOS profile and will automatically restart your system afterward. If the profile of macOS Catalina 10.15 is listed, then click on the "Upgrade Now" button adjacent to it.This will launch a dedicated section, listing the profile of the latest macOS version that is available. Under the Overview section, click on the "Software Update" button.From the Finder, go to the About This Mac feature. Though, the most recommended solution to do macOS Catalina upgrade is by visiting its Software Update settings.Alternatively, you can also go to the official website of Apple and click on the "Upgrade Now" button to start the process.Read the features and just install macOS Catalina from here. If your system is running on macOS High Sierra, Sierra, or El Capitan, then you can just go to the App Store and look for Catalina.Once you have taken care of all the above-mentioned prerequisites, simply follow these steps to learn how to update to macOS Catalina. To do this, you can go to the official website of Apple, visit the Mac's App Store, or go to its Software Update settings. If you are already using a stable version of macOS, then you can just upgrade to the latest macOS Catalina easily. Part 2: How to Upgrade to macOS Catalina 10.15 If it is packed with too much data, then you can delete any unwanted content from its hard drive. You can go to Finder > About This Mac > Storage section to see how much empty space is there on your Mac. Although, macOS Yosemite users would need at least 18.5 GB of free space instead. To successfully install macOS Catalina, you need a 4 GB RAM on your system and at least 12.5 GB free space on the hard drive. Furthermore, you can visit the Account Details option from here to know more about the linked Apple account. You can go to the iCloud application on your Mac to check the same. Therefore, you should know your Apple ID and password in advance. If you wish to do a macOS Catalina upgrade, then you might be asked your Apple ID for verification. Read More: Learn 3 Simple Methods to Backup macOS From here, you can take an extensive backup of your Mac to the attached media. ![]() Simply attach an external hard drive to your Mac and launch Time Machine on it. To do this, you can either manually move your files somewhere else or use Time Machine. ![]() If you don't want to encounter a similar situation, then consider taking a backup of your data beforehand. There are times when users end up losing their data while upgrading to a new operating system.
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