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2010 MacPro running 10.13.6 High Sierra.

I see this on the app store, not the normal page -

enter image description here

When I click to restart/install, I get a message "Available updates have changed" / "Click 'show details' to see the available updates. But that does nothing. A restart doesn't install the updates available.

I'm looking for a way to reinstall the App Store App. FWIW, I updated from Yosemite to High Sierra recently and hadn't seen this issue before the update. Mostly all else running fine.

The odd page rendering isn't the real issue, it's the fact that the update(s) offered to me don't install, just the cycle of error messages. Other linked answer has no solution to that problem either.

nohillside
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1 Answers1

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The CSS needed to render the old App Store is not being served. That explains only the visual change, not the lack of function.

You may need to update the OS or use a command line tool like mas if you can’t operate the controls without the web app rendering properly.

For security updates, you should be able to run softwareupdate -aiR from terminal and avoid the app needing to function at all. Should that fail a backup and restore or deeper triage is needed to isolate what’s causing the failure to operate in that app.

bmike
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  • Much appreciated. If the update process worked, I would not care about the rendering. I can't load the Security update being offered. – JTP - Apologise to Monica Jun 03 '21 at 14:26
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    If the GUI isn’t working, you should use the command line or perhaps conclude there are two issues, the CSS and issues with the Mac downloading the update @JTP-ApologisetoMonica – bmike Jun 03 '21 at 16:30