I was curious and compiled a Windows version (x64. Gtk3.22) 
If somebody wants to test ist, download it from here: https://filebin.net/8sxa5foeb7h0axdx
No installer included. Extract the folder “Rawtherapee_AWB” to e.g. your Desktop and run “rawtherapee_AWB.exe” inside this folder.
Cache and settings are saved into “localappdata\Rawtherapee_AWB”. It leaves your current installation untouched.