An executable named new_chrome.exe is the automatically downloaded new version of Brave at the location C:\Program Files (x86)\BraveSoftware\Brave-Browser\Application.
I delete brave.exe and rename new_chrome.exe to brave.exe.
When I run that one, everything is back to normal as the new version.
This is what is supposed to happen automatically under the covers on the first relaunch.
There is some other stuff that can be deleted, but what I just said is enough to do the trick.
@Passenger,
Thank you for clarifying, just wanted to make sure we were talking about the same thing. It definitely should be happening automatically – let me see what I can dig up on this.