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I've downloaded macOSUpdCombo10.14.6.dmg from the official apple site twice now in order to update my 10.10 to 10.14, both times when I try to open the dmg I am told that it can't be opened as the image is corrupt.

I'm at a loss, this isn't happening with other dmg files I have, I've run the disk utility function verify on my drive and it reports no errors. Is it the file? Am I doing something wrong? Any insights would be appreciated.

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    You can't upgrade 10.10.y to 10.14.6 with macOSUpdCombo10.14.6. The combo updater is meant to update 10.14.x (with x=0-5) to 10.14.6!
    – klanomath
    Jan 6, 2020 at 19:38

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Get macOS Mojave directly from the App Store and install it. This will give you the most recent version of 10.14.6, you won't need to run the combo updater afterwards.

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    I know that this doesn't explain the corrupted image issue, but there is no gain in analyzing that because you won't be able to use it's content anyway.
    – nohillside
    Jan 6, 2020 at 19:54
  • So the problem I'm facing is that the app store only lets me upgrade to 10.15.X, which is incompatible with my software. Any attempts to download a version of 10.14.X from their site leaves me with a corrupt dmg. I can't seem to come up with a way to get from 10.10 to 10.14... Jan 6, 2020 at 20:28
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    @MichaelHackman What happens when you try do download Mojave from the store via the link?
    – nohillside
    Jan 6, 2020 at 20:30
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    Wow, I'm dumb. Your link worked perfectly, totally didn't think to even click it. Thanks for the nudge there Jan 6, 2020 at 20:32
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    You don't need the combo updater afterwards, but you do need the security updates! After the one year mark, those additional security releases aren't rolled in. Of course, macOS will prompt you. Jan 6, 2020 at 21:52

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