There does not seem to be any folder RT5 is using. There’s a RawTherapee4 folder which originally contained my profiles (before I removed them in preparation for putting them in a RawTherapee5 folder). But there’s no other folder anywhere with “Therapee” in its name. In my ~/.config folder there are five folders. They are named darktable, filezilla, gtk-2.0, gtk-3.0, and qtcurve. The gtk-3.0 folder is empty.
Not sure it’s important, but downloading and installing the RT5 file from the official site produces an application that identifies itself as 4.2 in the Mac OS get info window. It does call itself 5.0-r1-gtk3 when clicking its own About tab.