OK, so what I did is searched my system and found the file referenced:
So I copied all three folders into the Paradise Trail\www\img folder, and merged them with the existing ones.
Progress! I was able to save! But when I load the game, it shows saves from both The Singing Scar and Paradise Trail:
If I try to load the saves from The Singing Scar (Singalin) of course it fails with a map load error.