Adobe Connect add-in does not launch under MAC El-Capitan

Hi,

I have 3 users, all of them with MAC OSX El-Capitan 10.11.6

They used to work with adobe connect add-in under safari and firefox browser with no problem.

One of the user installed the latest updated for office 2016 for MAC Released on March 14, 2017 (the other 2 claimed they didn't install any update but probably it was done automatically).

Then a day after the update, they reported that Adobe Connect opens directly in the browser and they are prompted to install the add-in again, which they did, but it's still not launching.

(Though i'm not sure if the office update caused this).

There is an article in adobe blogs I asked them to follow :

http://blogs.adobe.com/connectsupport/add-in-not-working-even-after-getting-installed-on-mac-osx/

but it didn't work ...

I suggested to enable pop up windows in Safari and Mozilla firefox, to clear cache from the  browsers and try again.

Then to manually uninstall the add-in , reinstall the latest one.

Then again uninstall and install the previous one.

Unfortunately nothing helped , Adobe Connect add-in is no longer launching in the virtual session.

Any ideas ?

Thanks