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. HOW LONG SHOULD IT TAKE TO RE INSTALL MAC OS SIERRA UPGRADEIf 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. HOW LONG SHOULD IT TAKE TO RE INSTALL MAC OS SIERRA HOW TOPart 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. HOW LONG SHOULD IT TAKE TO RE INSTALL MAC OS SIERRA DOWNLOADThis will download the macOS profile and will automatically restart your system afterward.
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