You should always always backup your saves. So here is how my structure looks for this game and all my games.
Attack on Survey Corps
|____ Attack on Survey Corps 18.1
|_____Attack on Survey Corps 182.
|_____Backup Folder (has saves and any patches like incest patch, unren patches like roll back)
<game files for the current version being played in this root folder>
So when I have two versions showing for my folder I know i have not played the latest release yet. I than delete all other folders like game, renpy, lib, ect. I than copy over 18.2 and than repeat with the backup folder. Now I have a clean game with just the backup needing to be copied right back over.
Now if any bugs happen I have a backup of the original 18.1 and 18.2 and I do not delete 18.1 until I have finished 18.2. Now when I go into my game folder I can tell if I have completed that release or not by seeing only the current release version folder. I also have a backup of 18.2 if the next update breaks anything.
I got tired of having saves possibly getting messed up or new release broke something in save so I need to reload in prior release and re-save the game again. All the various games I play here or new ones I decide to check out are done this way I easily have a good 50 games in my game folder from F95Zone to check out or play since releases for many are months apart.
I hope this tip is useful to some of you.