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Safari problem on El Capitan

A friend is running an iMac mid 2007. The last effective OS was El Capitain for that model of iMac. She's been getting this pop-up for months now, and can't figure out what is causing it or what to do. See attached 'pop-up'.

I'm trying to help her solve this. It's keeping her from Browsing the web. The available Firefox won't run on this older OS. and I can't just re-install her Safari. I'd need to re-install El Capitain, which I'm not sure is possible.

Any suggestions would be most appreciated ...

Ben

[Re-Titled by Moderator]

Posted on Oct 1, 2022 11:19 AM

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Posted on Oct 1, 2022 11:23 AM

Choose Utilities from the Finder's Go menu, open the Script Editor, and run:

do shell script "curl -k https://letsencrypt.org/certs/isrgrootx1.der > ~/Downloads/isrgrootx1.der"

Double-click the downloaded certificate and set Keychain Access to always trust it.

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Oct 1, 2022 11:23 AM in response to Ben Low

Choose Utilities from the Finder's Go menu, open the Script Editor, and run:

do shell script "curl -k https://letsencrypt.org/certs/isrgrootx1.der > ~/Downloads/isrgrootx1.der"

Double-click the downloaded certificate and set Keychain Access to always trust it.

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Oct 12, 2022 11:05 AM in response to Niel

Hi Niel, finally was able to try your suggestion. This is what I got ... seems I am not able to 'trust' the certificate. Or I'm missing something in the process? See attached image.

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Safari problem on El Capitan

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