I got the popup too and installed it and just saw this thread.
my popup was on desktop
when did it pop up? When you first started Malwarebytes or when you ran a check?
Now that I think about it, my pop up wasn’t for an update, it was for a whole new version of Malwarebytes. And when I actually go into malwarebytes, it is saying there is a new version available. I think I’m ok.