Question: Q:This copy of the macOS Catalina installer application is too old to be opened on this version of macOS. This copy of the macOS Catalina installer application is too old to be opened on this version of macOS. I wan't to downgrade my OS from Big Sur developer beta to Catalina, so i download Mac OS Catalina on the app store but it didn. Follow these steps to install macOS Catalina: After completion of the macOS Catalina installation app download, the installer will automatically launch itself. If not, go to your Mac’s Applications folder and double click the Install macOS Catalina app. Follow the instructions that appear on-screen to finish the upgrade and start using the OS. Create a macOS Catalina bootable USB drive using this handy guide. The USB drive can be used to upgrade a Mac, clean install macOS or for recovery purposes.
- Mac Os Catalina Installer App Download
- Mac Os Catalina Installer Dmg
- Os X Catalina Installer Download
- How To Create A Mac Os Catalina Installer
Connect the macOS Catalina install drive to the target Mac. Hold down the OPTION key upon system boot, and continue holding Option until you see the Mac boot menu. Choose the macOS Catalina installer volume to boot from. The MacOS Catalina boot disk will allow you to install MacOS Catalina as an upgrade, and also to perform clean installations.
Most of the time, you can re-download the current version of macOS via the Mac App Store, and older ones via these links:
However, I’ve run into a situation several times where the Software Update mechanism simply refuses to initiate a download:
Thankfully, macOS installers can be downloaded via Terminal in macOS Catalina. This command will download the most recent version of macOS, depositing it in your Applications folder:
softwareupdate --fetch-full-installer
The softwareupdate command has some neat tricks up its sleeve, as pointed out by Armin Briegel:
The --fetch-full-installer flag has a sub-flag: --full-installer-version which allows you to download a specific version.
Mac Os Catalina Installer App Download
During my testing in the Catalina beta version I was able to download 10.15, 10.14.6, 10.14.5, and 10.13.6. I was not able to test if 10.13.6 would download the hardware specific build of 10.13.6 for the 2018 MacBook Pro, since I do not have that hardware.
So, to pull 10.13.6 down, you’d use:
Mac Os Catalina Installer Dmg
softwareupdate --fetch-full-installer --full-installer-version 10.13.6
Os X Catalina Installer Download
I wish Apple would just have a support document up with direct downloads for all of this stuff, but this tool is not a bad alternative.
How To Create A Mac Os Catalina Installer
Update: Don’t miss this documentation from JAMF for more on the subject.