You can now download RawTherapee 5.0-r1 for Windows and macOS from our Downloads page. Linux users can get it from the usual place - their package manager; instructions available on our Downloads page.
Windows users: If you ran into the “There is no disk in the drive” error, we just updated the installer with a version which uses GTK+ 3.18 which does not exhibit this problem. It’s a fast “release” type build and it also includes a “debug” executable. Get it now from our Downloads page.