Staying with the excel version unless some has figured a way for the program to accept input data and save it.
If this is the app you are referring to: viewtopic.php?f=88&t=17569
Follow the entire thread, I had the same issues and it has to do with where Windows is storing your files. It is saving your files with changes but in a location the program is not looking for them. You have to move them to the PlasmaEst folders and overwrite.