I used to use Chrome and went looking for another browser when it started the “can’t download files securely” issue. I found Brave and all was well.
Brave has now started doing the exact same thing, on desktop (WIndows 10/64bit). It is fine, thus far, on Android.
I cannot find a single thing about this precise issue, anywhere. I do get the option to “keep” in the little dialog box for each download but, obviously, I’d like this to stop.
I’ve Just noticed this is only happening in private browing mode, without Tor.