For fellow Windoze users, a kind fellow who regularly compiles recent builds for us has compiled another most recent build
RawTherapee 4.2.582 (I always install these latest builds with no issues, at least not anything serious... On rare occasion little niggly things will pop up...)...
To keep my config, I always just make sure to install to same folder (C:\Program Files\RawTherapee). So since I already have RT installed to that directory, I just uninstall the current build, then during the install of the latest version, I remove the build number that the installer adds to the default install path (so in the case of this build, I install to C:\Program Files\RawTherapee instead of C:\Program Files\RawTherapee 4.2.5820)