I'm having the same issue, and I've also tried all of the above options, including everything from Mieleoneis (thank you, sorry!) as well as some other stuff I saw like trying a VPN (didn't work). A lot of the advice online involves changing Internet Explorer settings, but it's been discontinued so none of that works. For me, it breaks before the launcher, so reinstalling is not really an option. I have reinstalled the launcher on Steam several times.
https://ibb.co/XYvj71F