The Cef distribution seems to be out of order.
you can get the correct files for the version distributed with BG3 here https://www.nuget.org/packages/cef.redist.x64/79.1.36

just
* download package
* rename to .zip
* open and copy everything from the CEF folder into the Launcher folder of your BG3 installation

Do remember to make a backup of your Launcher folder before messing with it.!

That should fix it, well it did for me anyway.