There is nothing to figure out. Changing certain things will break the save. That's just how renpy works.mate you really need to figure out a save complatibility method:FeelsBadMan:.also about the mentioned number of images and videos for each girl on the changelog:are they the images added with 0.6 or the numbers of images with said girl in the game overall?
But I am positive that most of the classes are more or less stable now (meaning no new parameters have to be added).
I will add some smaller updates for version 0.0.6 as "bug fixes" even though they add content as well. All these won't break the saves. Making bigger changes will still break the save games in the future. But I hope that this will be a lot less frequent.
The number of images are the total number of images for each girl.