I got that popup as well, a couple of weeks ago if I'm not mistaken. I started to download the update and McAfee flagged it as malware or as containing some sort of virus, and I aborted the installation.
What kind of scam is this and how the hell did it happen?
I opened an old electrum wallet I have deposited BTC in and was unable to send them.
As I said, I got the popup too, but I didn't have any trouble using Electrum otherwise. That's strange.