Never used the app ( didn't even know there was one ! ), so i don't know where it install the game.
But the save is in the game folder\game\saves
Alternately you can also transfer the backup save which is found in :
C:\Users\*yourname*\AppData\Roaming\RenPy\Shuggerlain033
To :
C:\Users\*yourname*\AppData\Roaming\RenPy\Shuggerlain037
You can only copy the "persistent" files, it's the one with the gallery and seen text ( it's what i do ).