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  1. #1
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    IWT's Avatar
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    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    It is likely that many of my fellow members will have come across this post from OS X Daily; but some won't and I think it is worthy of a careful read because the article applies to all Mac Installer Applications:

    To Quote: "Many Mac users like to maintain a repository of MacOS installer packages for older versions of system software. For example, I (OS X Daily) have a collection of MacOS installers including for Mac OS X Snow Leopard, Mac OS X Mavericks, MacOS High Sierra, macOS Sierra, macOS Mojave, and MacOS Catalina. These can be used to build USB boot installers, restore systems, troubleshoot, perform clean installations of the various system software versions, perform upgrades to specific system software releases, and serve many other purposes. If you have a similar installer archive, it’s probably a good time to replace those installers with the new versions that won’t be expired"

    Full article here: How to Fix “application is damaged, can’t be used to install macOS” Errors

    Ian
    Last edited by chscag; 10-26-2019 at 01:29 AM. Reason: Title correction.
    Ian

  2. #2
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    Rod's Avatar
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    Yes I've struck this issue, I only bother to keep the last macOS as a bootable USB thumb drive installer now. That has gotten me out of trouble a few times.


    Sent from my iPhone using Mac-Forums
    I used to be conceited but now I'm perfect.

  3. #3
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    krs's Avatar
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    Quote Originally Posted by IWT View Post
    . If you have a similar installer archive, it’s probably a good time to replace those installers with the new versions that won’t be expired"
    I'm glad you posted this, but.....

    How does one download installers of old macOS versions if Apple always pulls them when a new macOS becomes available?
    I know that Randy posted links to older macOS installers a while back, but these were somewhat hidden and not on the Apple store as I understand it.

    It was suggested that one can get around that issue if one turns off WiFi (or the connection to the net) when running the installer.
    Makes some sense - anyone know if that is a work-a-round?

  4. #4
    Never Mind

  5. #5
    You might want to read the following at this link How to Fix a Damaged macOS Installer - MacRumors it gives you links to download previous versions of Macos and explains what is going one.

  6. #6
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    krs's Avatar
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    Thanks,
    Sounds like a great idea to have the latest version of the installers (with all the updates) that one may need to use.

    I'm planning to download at least ElCapitan, High Sierra and Mojave.
    I have one 2017 MacBook Air on ElCapitan which is not really officially supported by Apple, so I think if nothing else, that is a good one to have.

    Why did you post "Never Mind" in your previous post - just wondering...

  7. #7
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    Rod's Avatar
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    In my opinion you really only need the last one unless you are a repairer or collector of vintage model Macs.
    If for example Catalina crashed on me for some reason and I had decided I wanted to return to Mojave I could boot, erase, format and restore to Mojave with my USB thumb drive installer of Mojave.
    I could then restore my data from my CCC backup or Time Machine backup of Catalina.
    Having done that if I decided I wanted to go back to High Sierra I could download the HS installer from my Purchases on the App Store and create a bootable installer from that and repeat the process above.
    I can not imagine why I would want to go back further than that because that would be to an unsupported macOS and prior to APFS.
    If I had a 2010 MBP that was still useable and the OS crashed I could download the installer on my current device and create a bootable installer when and if I needed it assuming it was not my only device there is no problem.
    I used to be conceited but now I'm perfect.

  8. #8
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    IWT's Avatar
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    Quote Originally Posted by krs View Post
    I'm glad you posted this, but.....

    How does one download installers of old macOS versions if Apple always pulls them when a new macOS becomes available?
    I know that Randy posted links to older macOS installers a while back, but these were somewhat hidden and not on the Apple store as I understand it.

    It was suggested that one can get around that issue if one turns off WiFi (or the connection to the net) when running the installer.
    Makes some sense - anyone know if that is a work-a-round?
    The article I linked to gave details of where previous versions of the OS could be found.

    And thank you for your kind words krs.

    Ian
    Ian

  9. #9
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    ferrarr's Avatar
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    I keep all installers, that will run on my Mac Mini. I have from Yosemite to Catalina, but when I go into the macOS App Store, not one of the installers are listed with all my other "Purchases", so I am unable to download them again. If they still showed in the macOS App Store, I wouldn't have to keep a copy of them.
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  10. #10
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    krs's Avatar
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    Quote Originally Posted by ferrarr View Post
    I keep all installers, that will run on my Mac Mini. I have from Yosemite to Catalina, but when I go into the macOS App Store, not one of the installers are listed with all my other "Purchases", so I am unable to download them again. If they still showed in the macOS App Store, I wouldn't have to keep a copy of them.
    Refurbished items one buys from Apple don't seem to show up in the Apple store either.
    I bought a MacBook Air last year that came with Sierra and neither the computer or the software show up - I assume that is normal

  11. #11
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    chscag's Avatar
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    Quote Originally Posted by ferrarr View Post
    I keep all installers, that will run on my Mac Mini. I have from Yosemite to Catalina, but when I go into the macOS App Store, not one of the installers are listed with all my other "Purchases", so I am unable to download them again. If they still showed in the macOS App Store, I wouldn't have to keep a copy of them.
    @Bob:

    Keep in mind that if the certificate to any version of macOS expires, it may not be possible to download it. That's why keeping the installers is important.

  12. #12
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    krs's Avatar
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    Quote Originally Posted by chscag View Post
    @Bob:

    Keep in mind that if the certificate to any version of macOS expires, it may not be possible to download it. That's why keeping the installers is important.
    From the articles I read I thought the opposite was the case, like:
    When one wants to use a previously downloaded installer (that is one already on ones Mac), the installer checks for a valid certificate at that time and if the certificate in the meantime has expired, one get that "Installer is damaged message"
    So the installers that had been downloaded are useless.
    Thus also the installer links in Mac Rumors which were supposed to be the latest version with a current valid certificate.
    And also the comment if turning off WiFi gets around that.

  13. #13
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    Randy B. Singer's Avatar
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    I just logged in to post on this very topic! Here is what I posed elsewhere:

    If you were smart, and squirreled away a copy of the macOS installer program (maybe on a flash drive) in case you needed it...well, it probably won't work anymore because their certificates expired:

    If you've got an old macOS install image, it will probably stop working today
    If you've got an old macOS install image, it will probably stop working today

    This article provides links to download installers with valid certificates:
    How to Fix a Damaged macOS Installer - MacRumors
    Randy B. Singer
    Co-author of The Macintosh Bible (4th, 5th, and 6th editions)
    Mac OS X Routine Maintenance • http://www.macattorney.com/ts.html

  14. #14
    Problem with Mac Installer Applications - application is damaged, can not be used to install macOS
    chscag's Avatar
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    Thanks Randy for the clarification. The thread at MacRumors was an eye opener about the certificates expiring on Oct 24th of this year.

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