Thanks for that. It's strange that my iMac has been saying that there was a download, however, every time I checked there was nothing there. I checked on, "About my Mac" today and there was Sequoia waiting to be installed.
So, did that and then ran Malwarebytes and it said that there was a Malware on my Mac. It asked me to check notifications, which I did and that was already totally up to date and in place and I re-ran Malwarebytes and everything is perfect.
My feeling is that Malwarebytes do everything to get you to sign uo to a plan, which I do not need.
I have used Malwarebytes for many, many years, however, they are hassling a lot nowadays to upgrade, which is silly as it is time consuming and negative.
Of course the red dot is still there and still unwanted.