I have been trying it with firefox and edge chrome also. Hmm..... going to try again!Try a different browser. I had the same issue in my main browser, but the download worked in Edge Chromium.
*UPDATE* I installed the full edge chromium a few weeks ago but still also had the dev version too. The Dev version got wiped and has no extensions installed but that is what worked!! I got the McAfee installer to download with it. Thanks much for the idea. Not sure what extension is causing the error though.