I would like someone to help me a little.
I installed Anaconda and Sen2cor but the gold of the execution of the atmospheric corcetion it does not work. I understand that it always tells me to indicate a location and that python.exe does not exist. I do not really understand what I have to do to correct that. I have windows system. thank you i’m waiting.

which sen2cor version are you using? You no longer need Anaconda since sen2cor 2.4
You can still fix this error by following this instruction: Specify system variable PYTHON_BIN for Sen2Cor

But it is better to use the latest version: A tutorial for 2.4 (or later) is given here: Sen2cor 2.4.0 on SNAP 6.0