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Mojave installation issue

  • October 24, 2019
  • 20 replies
  • 59 views
mhasman
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New day, new challenge...

Experiencing an issue installing Mojave.

Some Macs model 2016-2017 we reimage by booting up from external drive, format and run "Install macOS Mojave", lates downloaded and saved version 14.6.06. From today, installer gives me an error:

"This copy of the install macOS Mojave application is damaged, and can't be used to install macOS"

Seems like Apple changes something blocking the installer... As enterprise, we are not ready to jump to Catalina right now, we have to stay with Mojave for a while. I'm looking for recommendations how to fix the issue, suggeestions how to be able reimagine with Mohave; maybe where/how to download latest Mojave installer.

Mac admins, please advice :) Thanks!

Best answer by LukeMichelson

@mhasman If your Mojave installer was download before Oct. 14 2019 you need to download it again. This is a know issue with the cert for the installer expiring today. Here is a link to download Mojave - https://support.apple.com/en-us/HT210190

    20 replies

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    • LukeMichelson
    • Employee
    • Answer
    • October 24, 2019

    @mhasman If your Mojave installer was download before Oct. 14 2019 you need to download it again. This is a know issue with the cert for the installer expiring today. Here is a link to download Mojave - https://support.apple.com/en-us/HT210190

    mhasman
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    mhasman
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    • mhasman
    • Author
    • Valued Contributor
    • October 24, 2019

    @luke.michelson Luke, thank you very much!

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    • lohika
    • New Contributor
    • October 28, 2019

    Today is 28 of October.
    Unfortunately, Apple still did not fix the expired certificate issue on OS Mojave app.
    ""This copy of the Install macOS Mojave application is damaged, and can't be used to install macOS"

    J_Mukite
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    • J_Mukite
    • New Contributor
    • October 28, 2019

    Can also confirm this.

    R
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    • rrouleau
    • Contributor
    • October 29, 2019

    10/29 - URL to download Mojave is now broken.

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    • larry_barrett
    • Contributor
    • October 29, 2019

    In Terminal, run:

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

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    • rrouleau
    • Contributor
    • October 29, 2019
    Posted: 10/29/2019 at 7:41 AM CDT by larry_barrett In Terminal, run: softwareupdate --fetch-full-installer --full-installer-version 10.14.6

    This seems to be a Catalina only option/flag, but may be a good workaround for the time being.

    J
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    • johnorso
    • New Contributor
    • October 29, 2019

    Still not allowing any Mojave updates or Mac OS Installers. Seems like the links to the app store are broken.

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    • larry_barrett
    • Contributor
    • October 29, 2019

    @rrouleau as far as I can tell it is Catalina only. The softwareupdate tool is present in Mojave, but they are not currently listing any software (softwareupdate --list) as being available. I don't have any devices pre-Mojave, so can't really test it :)

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    • sam_g
    • Contributor
    • October 29, 2019

    For anyone needing to get a new installer of Mojave with the right certificates, you can use installinstallmacos.py. Rich Trouton has step by step instructions on how to use it here: lhttps://derflounder.wordpress.com/2018/02/27/using-installinstallmacos-py-to-download-macos-high-sierra-installers/t

    You need to download the 18G103 build for 10.14.6 that is dated 2019-10-14.

    R
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    • rrouleau
    • Contributor
    • October 29, 2019

    @larry_barrett - Yes, the softwareupdate tool has been around for may generations of the macOS. --fetch-full-installer is the Catalina only flag that is new.

    The command did work perfectly for my needs (to grab a full install of 10.14.6 with new cert) on a Catalina machine, so thank you for pointing out this new flag.

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    • erichughes
    • Valued Contributor
    • October 29, 2019

    Where does the softwareupdate command store things? I don't see it in the regular /Library/Updates folder?

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    • larry_barrett
    • Contributor
    • October 29, 2019

    The current Catalina version downloads and installs into Applications by default.

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    • charlesj
    • Contributor
    • October 29, 2019

    I ran the script and got the DMG... mounted and copied the installer to my desktop but now JAMF Admin is zipping it when I try to upload to replace the expired installer... any idea why?

    mhasman
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    • mhasman
    • Author
    • Valued Contributor
    • October 29, 2019

    Maybe URL was broken because of Mojave Security Update 2019-001 release? Hope it is coming back soon

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    • erichughes
    • Valued Contributor
    • October 29, 2019

    The App Store link is working again.

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    • gabester
    • Valued Contributor
    • October 29, 2019

    @J.Mukite @lohika On a different thread (one of the packagepocalypse ones) I saw users ongoing "damaged" report may be resolved by a reboot; give that a try and report back...

    J_Mukite
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    This link has links to the last 6 OS

    https://www.macrumors.com/how-to/how-to-fix-a-damaged-macos-installer/

    J_Mukite
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    • J_Mukite
    • New Contributor
    • November 5, 2019

    @Sterritt I actually have had some success with reboots. Thank you.

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    • afianagung
    • New Contributor
    • November 5, 2019

    Just back date your system, I was tried backdate for 1 years and it's work!! :)

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