As explained by @kraftek, Sen2Cor version 2.8.0 contains new features and improvements respect to Sen2Cor v2.5.5 but it doesn’t support some old products. For this, we have decided to support both sen2cor versions by two different plugins in SNAP, so you can execute both. For that, two new plugins have been created and are available in the update center: SEN2COR280 and SEN2COR255. With these changes, the old Sen2Cor plugin has become obsolete.
The recommended steps for working with the new plugins are:
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Uninstall the old sen2cor plugin if you installed it:
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Tools -> Manage External Tools -> Select the Sen2cor row and click on the delete button
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Tools -> Plugins -> Installed : Select the Sen2Cor plugin and uninstall it.
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Install the new plugins
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Tools -> Plugins -> Available plugins : Select the plugins and install them
If you do this properly, you should have now new menu items:
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Download and install the Sen2Cor tool from SNAP:
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Tools -> Manage External Tools : Select one of the operators and click the Edit button. Go to the “Bundled Binaries” tab and click the button for Download and Install
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Repeat the same steps for the other Sen2Cor version.
Finally, you should see this in the External Tools window:
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