I have recently installed the sen2r plugin in r for extracting level 1 Sentinel-2 images from ESA's Long Term Archive and using sen2cor correction to obtain level 2 scenes.
An issue I face is that the GUI seems to not let you apply sen2cor. It says that level 2 images are required. I have tried to use the standalone sen2cor processor which comes as a part of sen2r() package in R, but not all scenes get corrected.
Does anyone have experienced something similar or can provide guidance with this?