Supervised Classification output file of the "Train and apply classifier"

I think you can retrieve the values for the two classes without the automation.
Did you only use one band for the classification? This is critical for random forest classifiers, please have a look here: Random Forest Classifier: SNAP VS sklearn - #2 by ABraun

there is no need to uninstall the previous version, but you need to download version 7 and run it to overwrite the previous one.