Home > Mac administration, macOS > Downloading macOS installers with updated signing certificates on macOS Catalina

Downloading macOS installers with updated signing certificates on macOS Catalina

As a follow-up to last week’s expiration of the certificate used to sign previously-released macOS installers, Apple has released re-signed macOS installers with the new certificate which is good until April 2029.

For those who archive older macOS installers, this means that the macOS installers in question will need to be re-downloaded. macOS Catalina has added some new functionality to the softwareupdate tool which can assist with this. For more details, please see below the jump.

To download the latest installer for macOS Catalina, which is currently at version 10.15.0, please run the command below with root privileges:

softwareupdate --fetch-full-installer --full-installer-version 10.15

Note: Normally the version is specified as 10.x.x, but Apple has historically listed a .0 release as 10.x. So in this case, the softwareupdate command uses 10.15 for macOS 10.15.0.

You should receive a message that the the installer is downloading and installing. In this context, the message refers to installing the macOS Installer app into the /Applications directory on the Mac.

Screen Shot 2019 10 27 at 9 31 25 PM

Once the process has completed, you should receive a message that installation has completed successfully.

Screen Shot 2019 10 27 at 8 51 58 PM

To verify, check to make sure there is now an Install macOS Catalina app in the /Applications directory.

Screen Shot 2019 10 27 at 8 52 12 PM

To download the latest installer for macOS Mojave, please run the command below with root privileges:

softwareupdate --fetch-full-installer --full-installer-version 10.14.6

Screen Shot 2019 10 27 at 9 05 29 PM

Screen Shot 2019 10 27 at 9 05 38 PM

To download the latest installer for macOS High Sierra, please run the command below with root privileges:

softwareupdate --fetch-full-installer --full-installer-version 10.13.6

Screen Shot 2019 10 27 at 9 14 08 PM

Screen Shot 2019 10 27 at 9 14 13 PM

macOS Sierra is not available for download via the softwareupdate tool, but it is available via the Mac App Store (MAS). Apple has a KBase article, available via the link below, which shows how to access the macOS Sierra page in the MAS:

https://support.apple.com/HT208202


Update 10-28-2019:

Mike Brogan correctly points out that the KBase article is no longer linking to the MAS, but instead provides a download link to a disk image file which contains the Sierra installer.

It also appears the Apple KBase article for upgrading to OS X El Capitan and the Apple KBase article for upgrading to OS X Yosemite have similar download links to a disk image file which contains the OS X installer.


To access the macOS Sierra page directly, please click on the link below:

https://itunes.apple.com/us/app/macos-sierra/id1127487414?ls=1&mt=12

That link should open the MAS and take you to the macOS Sierra download page.

Screen Shot 2019 10 27 at 9 15 20 PM

Categories: Mac administration, macOS
  1. Jeff Xu
    October 28, 2019 at 6:57 am

    I run the exactly same command of macOS Catalina on 10.15 MacBook Air with root privilege, but got an error said “Update not found”. Any clue?

  2. Bryan Pietrzak
    October 28, 2019 at 1:59 pm

    Unfortunately, you can’t download 10.12.6 Sierra from Catalina – says product not found. I was able to download it from 10.11.6, but it looks the packages are still using expired certs 😦

    Likewise, Safari 12.1.2 is still signed using the old cert – all the other Safari packages in softwareupdate (going back to 10.7 Lion) have been resigned with the new cert – EXCEPT Safari 12.1.2.

    • Harold Demetria
      November 5, 2019 at 5:57 am

      Do you have the link of the old versions of safari?

  3. October 28, 2019 at 4:47 pm

    Running into the same issue with 10.12.6… need an updated installer to repair some of our 10.12.6 machines which are suddenly booting up with a “no entry” symbol when people try to login… An overlay install has been the only way to resolve that I’ve found so far.

  4. Everette
  5. October 28, 2019 at 6:46 pm

    Yeah, once I had that InstallOS.dmg, I found that I couldn’t run the InstallOS.pkg inside it on Catalina. Had to run it on another Sierra system I still had (it might have run on 10.14, but didn’t have one in front of me at the time) for it to create the necessary Install macOS Sierra.app needed to create the USB drive.

    Multiple attempts to create the USB drive (using https://support.apple.com/en-us/HT201372, including the –applicationpath variable) from a Catalina machine results in failure: “Terminating app due to uncaught exception ‘NSInternalInconsistencyException’, reason: ‘Couldn’t posix_spawn: error 35’”

    On 10.14, getting the error that the USB drive “is not a valid volume mounting point” no matter how its formatted.

    Getting the same on a 10.12 machine as well… tried multiple USB drives, so not sure what I’m missing…

  6. Bob
    October 28, 2019 at 7:04 pm

    Suspect that the issue with downloading an old installer from App Store on a system that is running a macOS version that is newer than that is not allowed — you can’t go backwards with system installs this way — you need to boot up using an OS that is equal to or older (not newer) than the version of macOS that you’re trying to download. That’s been my experience any way. Just to double-check I just booted an older MacBook from a Mtn. Lion boot disk and the same link that didn’t work from High Sierra still doesn’t work, but this time it says that Sierra is already installed, which is not true, so no idea why it’s doing this … sure wish that there was an easy way to download any macOS installer you wanted on a system that was running any version of macOS … this simple capability is just getting so darned complex ;-(

    But at least the links to the “dmg” files within the articles seem to work fine, so that’s something. Thanks very much for posting those. Any idea on where complete older installers can be found, even really old versions like 10.0 or 10.1 or 10.2. or 10.3 or 10.4 or … — found an old PowerBook that had been behind a bookcase for years recently and wanted to play around with it, and also wanted to see if I can find a complete set of installers so that can do some testing.

    Thanks again…

  7. Jason Gates
    October 28, 2019 at 8:36 pm

    When trying to re-download 10.15, 10.14.6 or 10.13.6 it would always fail if I used sudo. I tried 10.15 again by copying the command “softwareupdate –fetch-full-installer –full-installer-version 10.15” and by accident didn’t add sudo and it downloaded fine. I tried again with 10.14.6 and 10.13.6 and they all downloaded fine. I now have all three installers in my Applications folder on one machine. Just thought i would share.

  8. Mike
    October 29, 2019 at 5:46 am

    How might you download if you are still on Mojave?

  9. October 29, 2019 at 8:27 pm

    This is extremely helpful as are many of your posts. Thank you! Can you shed light on way the newly signed Mojave installer app is no longer supporting the –eraseinstall option that many of us use to erase a mac’s drive and reinstall the OS. I have downloaded the new Mojave installer with a Mac running Catalina. Then copied that installer to a mac running Mojave that I want to nuke.

    With “Install macOS Mojave” in the /Applications folder on that mac to be nuked, in the past I was able to run the command: “/Applications/Install\ macOS\ Mojave.app/Contents/Resources/startosinstall –eraseinstall –newvolumename “Macintosh HD” –agreetolicense –nointeraction ” To nuke the mac and reinstall a fresh install of Mojave. That isn’t working. Console log reports from Process osinstallersetupd “NSURLCOnnection finished with error – code – 1100” which isn’t very helpful. Any Thoughts?

  10. October 31, 2019 at 6:21 pm

    Expecting a full Install macOS Sierra.app, I followed the Apple link and downloaded the InstallOS.pkg file. I had an external boot drive with Sierra installed and an older Install macOS Sierra.app in the Applications folder. I booted a 2012 MBP from the external drive and erased the internal drive and ran InstallOS.pkg from the external boot drive expecting a working installer, but the install ran very quickly with no interaction. When it finished, my older Install macOS Sierra.app had been updated and has installed Sierra 10.12.6 (16G29) without a problem. My older installer was dated July 14, 2017, modified June 24, 2019 and was version 12.6.03. Next up: will it create a good USB installer?

  11. Harold Demetria
    November 5, 2019 at 5:49 am

    Sierra app is no longer available in MAS.

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