Hi,
best way to be sure to remove the previous version(s) in anaconda before a new installation:
“ pip uninstall sen2cor “ (see http://s2tbx.telespazio-vega.de/sen2cor/sen2cor-sum-2.0.pdf , section 3.1.5 for details.)
Then continue as is written in section 2.1 or 2.2 of http://s2tbx.telespazio-vega.de/sen2cor/SETUP.pdf
“ python setup.py install “
Cheers,
Uwe