At least you are a sober senile old man. (?)
Oh yes, I am clean on me and very sober…
I’ll join this approach tomorrow. Be well!
Ah! I did not think that the GIMP build could be the culprit.
Here I use also Partha’s builds.
Thanks @Jacal
Merci à vous pour votre patience et salutations de la part d’un autre vieil homme sénile 
Oh…pas l’air si sénile que ça gaaned92 ! 
Oops… I upgraded together
GIMP (2.10.8) and
RT (5.4-1133-g5e0cbd4c6)
and again, I can’t start RT from GIMP for a RAW file.
Is there a new problem ?
@luxapy
With partha’s GIMP 2.10.8 and last RT dev buid, I am no longer able to sart RT from GIMP.
I will try to investigate.
@agriggio Help! 
Here the RT ticket about automatic registring RT in GIMP: Windows installer: Add Registry entry with full executable path · Issue #4783 · Beep6581/RawTherapee · GitHub
In order to work, you have to install RT with the installer.
I am searching now if GIMP 2.10.8 includes the corresponding modifications. edit : yes
error: Partha’s GIMP is 2.10.6 but it should work
RT path is searched in this order:
1- in environment variable RAWTHERAPEE_EXECUTABLE
2- in registry HKLM section so you have to install for all users
3- in PATH
In 2.10.8 it will be also searched in registry/HKCU