I bought and downloaded "The Alchemist" and have completed the entire game.  But all but three of the images in the Gallery remain locked with absolutely no instructions as to how to unlock the rest of them.

 Also, under Erotic Content in the game settings, I selected "(+18) Text and Images" yet there are no   "erotic" images in the entire game, not even any nudity other than the back view of a man standing under a waterfall nude.  Certainly  nothing "+18"!