Chapter in this post:
At least under macOS 10.15 Catalina it is now possible to download complete installer files from old macOS versions via the terminal. In the following I will show you the command line required for this as well as a list with the individual versions of old Apple operating systems. So you can download the correct installer for the Mojave downgrade as well as earlier system versions for your old Mac, iBook or the like. Learn how to downgrade from Catalina to Mojave Is there ... here; a list of the App Store download sources for old macOS installers i have here for you.
With the current operating system for Apple computers, macOS 10.15 Catalina, there is a new terminal command with which installer files can be pulled from the Apple servers quickly and easily. I just tried the command line on macOS 10.14 Mojave - and it didn't work. This possibility of downloading installer files is currently really only limited to the latest system. If you have this, you can load old macOS installer files with the following command line in the terminal (enter the number combination instead of "VERSION NUMBER"):
$ softwareupdate --fetch-full-installer --full-installer-version VERSION NUMBER
For version number, for example, you can enter "10.14.6" to download the latest Mojave version. The addition ".6" after 10.14 refers to the added system update. This is especially important if you download the installer for a Mac, iMac or MacBook that does not have an Internet connection and therefore cannot load bug fixes and patches.
If you enter the command and confirm with Enter, then (with the version number above as an example) “Downloading and installing 10.14.6 installer” is displayed - as well as the line “Installing: xx%” with the corresponding download progress. But don't let this mislead you into assuming that the terminal will now automatically downgrade. Nothing is installed, only the installer is stored on the hard drive as a download;)
A list of the installers of old macOS and Mac OS X versions that are gradually disappearing from the App Store you can find here. In the post from March 2019, however, I only listed the regular version numbers for you. In the following table I add the latest versions so that you can download the last major update for the placeholder "VERSION NUMBER" in the terminal command above.
|Mac OS X or macOS||Version number||Latest version|
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.