Can't install Arduino Create agent on MacOS

MacOS 10.13.6, Safari 13.1.2, Arduino ADE 1.8.6. Was working fine with UNO and Arduino Create agent 1.1. Bought a UNO Wifi Rev 2 and the IOT cloud page says Arduino Create agent not found.
Downloaded Create Agent 1.2.2 but it won't install. I get the warning about installing internet downloaded software, hit OPEN and nothing happens. Agent icon does not appear in the top right menu bar, Agent is not running in Activity Monitor and it's icon doesn't show up in the Launcher window like the old Arduino Create Agent's icon did. I recently used CleanMyMac and I think it clobbered something. I tried using three different browsers (Safari, Opera and Firefox) and none of them will install the Arduino Create Agent plugin. Tried uninstalling the old agent 1.1 to no effect. Now I have no Agent and can't load a new one.

In order to make all relevant information available to the reader, I'll share a link to the other report about this at:

@delucadana did you follow the instructions provided by umbynos here?:

umbynos is very knowledgeable about the Create Agent, so this is definitely worth a try.

I tried it on the PC and there's no problem. The Arduino Create Agent plugin installs (onto Edge borwser) and everything works as expected. I sent a note to the CleanMyMac support people to see if they know of anything needed to install a browser plugin that may have been deleted by their "junk" scan.

There were cases under WINDOWS that some cleaning tools deleted critical CREATE files.
In almost all cases a simple RE-INSTALL fixed those issues.

Not seen that issue under windows for a very long time so I can only assume that the issue with either CREATE of the cleaning program was fixed.
You have done the correct thing by seeking answers from both sides.

Note you may still have to UN-install the older damaged version to install a new copy.
Not always required but still the best method.

So what do I reinstall? I've reinstalled the Arduino Create Agent before and after uninstalling the previous agent. Since it's a browser plug-in I would like to reinstall the browser too which is Safari. However, I cannot find Safari in the Apple App Store as a separate downloadable app, I think because it's built into MAC OS.
I don't think that would help anyway based on the fact that the two other browsers failed in the same way so unlikely all three browsers were broken. I don't want to attempt reinstall of the entire MacOS.

Trying again with new software. I downloaded latest Arduino IDE app and the Create Agent 1.2.3 for Safari. The same error occurs. It will not install. I get this screen:
image
double click the installer and get this screen:
image
Click Open and sometimes I get this screen:

When I try again I get:

It never installs.

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