I was trying to process data in SNAP with sen2cor 2.8. Sen2cor has been installed successfully but I can not start to run it. ‘‘I am left with a black console window where nothing happens and an instantly disappearing progress bar.’’ I have tried to set system variables of python.exe again but it still did not work. I was wondering if it is because of my python version 3.6. Should I use python 2? Is the sen2cor under the umbrella of python 3 or above?