#Invalid macos installer install disk creator mac os
This can usually be done provided you have a copy of the installer for the version of the Mac OS you wish to return to. You may have noticed that with each new version of the macOS that’s released, there are usually some users who have one or more issues with it and wish to return to a previous version. It allows you to archive a copy of the macOS installer, which you may need if you ever want to downgrade to the version on the installer.It lets you install the OS on multiple Macs without having to download the installer multiple times.By booting to the installer, you can perform a full erasure of your normal startup device before installing the new OS. It allows you to perform a clean install of the operating system on your Mac using the existing startup drive.There are multiple reasons for having a bootable macOS Catalina installer. Why Make a Bootable macOS Catalina Installer? Macs with Thunderbolt 3 can also use a USB flash drive as bootable media (an adapter may be required).
All current Macs support booting from a USB port.You can buy a new USB flash drive large enough for this project for less than $10. It’s small and easy to store in a safe place.A bootable flash drive is the preferred method, however here’s why:
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