I always create a bootable USB thumb drive for that purpose. The next step would be to copy it to a bootable drive of some sort. If the download finished did it launch the installer splash screen and then tell you it couldn’t install it? If so, then all you need to do is quit the installer and it will be found in your /Applications directory (folder). When the download finishes Catalina will not allow it on the SSD. Regardless, you will have to erase the internal drive entirely before you can install Mojave due to Catalina’s bifurcated drive structure. It’s particularly fussy if your Mac is equipped with a T2 security chip since you have to set up an account before you can use Security Utility to enable booting from external drives. Unfortunately, the process to install Mojave isn’t straightforward, requiring a Mojave Installer USB drive. Mac scripting expert (and author of the new book Moving to zsh) Armin Briegel has published a guide explaining how to roll back a new Mac that ships with Catalina to Mojave. Luckily, downgrading a new Mac from Catalina to 10.14 Mojave is possible for models other than the 16-inch MacBook Pro and the 2019 Mac Pro. We’re still hesitant to recommend upgrading to Catalina, particularly if you use Mail, since reports of email data loss continue.

How to Downgrade a New Mac to Mojave from CatalinaĪs expected, Apple has started shipping new Macs with macOS 10.15 Catalina. #1661: Mimestream app for Gmail, auto-post WordPress headlines to Twitter and Mastodon, My Photo Stream shutting down.#1662: New Macs, 12 top OS features for 2023, vertical tabs in Web browsers, watchOS 9.5.1.

#1663: Exploring the Apple Vision Pro, 12 more OS features coming in 2023, new Apple service features, Apollo shuts down.

#1664: Real system requirements for OS 2023, beware Siri creating alarms instead of timers.

#1665: Important OS security updates, abusive Web notifications, solve myopia with an iPhone, Self Service Repair.

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