first, you should never use old krpano versions because
your tours wont work properly on modern phones!
there have been many changes in the last years,
specially on iOS. 1.17 is like 100? years old?

even 1.20 is pretty old... the newest version is 1.21
then... the droplets have been removed, but those configs still exist.
just open the krpano Tools.app, go to the first tab (Make VTour),
select the config on the bottom left and then drop your images on the window