"New Critical Bug in Adobe Flash Player"

Yesterday I got this popup message on my screen. I did not click on any button, just used the x in the upper right corner to get rid of the message.

Norton - Adobe Flash Player issue.JPG

Then I proceeded to uninstall whatever version I had in my laptop and reinstalled the newest version from the official Adobe webpage - version 18 NPAPI.

Today, the exact same message popped up and I now wonder what the issue might be. There is no doubt that the newest version installed:

Adobe Flash Player installed.JPG

Has anyone experienced the same issue?

Thanks for all help.