I 've downloaded the newest version of the Diff-Amp Calculator V3.0.0. After the installation I just run the application and in the background of the window the error message "Unexpected Condition", Error Location: Resistors, Error Code and Description: 0, appears. You can use the aplication but the error message stays in the background.
I've attached the support text file!
I'm not sure, if the application works right?