On other topic a person with nick chris said:
heres what worked for me:
I replaced
\Anaconda\Scripts\openjp2.dll with the openjp2.dll from the previous
2.0.4 sen2cor realease in the software archive, see:http://s2tbx.telespazio-vega.de/sen2cor/archive/sen2cor-2.0.4/12
Download the zip-archive and unpack it.
Go to the directory sen2cor-2.0.4\sen2cor\build\lib.win-amd64-2.7 which contains an openjp2.dll.
Replace the original openjp2.dll in your Anaconda Installation ( \Anaconda\Scripts) with this one.
I am not sure, if this is the correct way to solve the problem!