Take Control of Upgrading to Catalina by Joe Kissell

Author:Joe Kissell
Language: eng
Format: epub
Publisher: alt concepts inc.
Published: 2019-08-26T00:53:42+00:00

Download Catalina, as described in the previous topic.

Copy the installer from /Applications onto the external media of your choice.

Note: Instead of (or in addition to) copying the installer, you could follow the steps in the sidebar Make a Bootable Catalina Installer Volume to create a bootable copy.

Copy the Installer to a Safe Place

Unlike most software that you download from the App Store, what shows up in the /Applications folder after you download Catalina is an installer (an app called Install macOS Catalina); you must run the installer to put all the necessary pieces in place. During this process, something surprising happens: the installer is deleted! That’s right—once Catalina is up and running, if you look in /Applications, the installer will be gone.

I presume the reason for this is that once Catalina is installed, Apple wants to give you back the 6.8 GB or so of disk space the installer was taking up, since you likely won’t need the installer in the future (and can download it again if you do). But what if you want to install Catalina on multiple Macs—or reinstall it later on the same Mac—without having to download that huge installer again? I’ll tell you what: you’d better put that installer in a safe place before you run it!

Now, before going any further, I should add some nuance to the “Catalina installer deletes itself” concept. The installer deletes itself only when both of the following are true:

The installer is in /Applications on your startup volume.

Download

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