the installed sen2cor is not appearing inside the available plugins of SNAP… 
I read and watch all references on sen2cor site and youtybe… but it do not work for me…
maybe you can tell others how you fixed it.
I had to reinstall paython and sen2core other times! after 3th install, i could see sen2cor in SNAP actively. but when I worked with I faced with that error (attached pic) and I was stopped … However when I restarted my computer sen2cor in not active anymore : | I guess I have to unisntall and install all related programs before each use!
Please see http://forum.step.esa.int/t/external-tools-disappear-when-restarting-snap-workaround for the installation issue. About the other error, could you please upload your image again? I am not able to see it.
Thanks a lot… i will see it soon definitely… also I can’t… when I want to use the software I had to reinstall it 
nonetheless some times my image was not loaded! could you give me your telegram or Instagram or Facebook ID? we need help maybe we can work together better…
Hi Farnoosh,
I have answered you in the other topic about the error you had with anaconda, please see Sen2cor run problem_ anaconda error.
I think it is much better to continue using the forum for reporting all the problems/errors/doubts. There are a lot of users here who can help and other ones who will have similar questions in the future and in this way they will find the solution easier.
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thanks a looooot…
I have the same problem