I can't open custom stories on my Mac! :(

[grimfandango]

Hello everyone!
This is my problem: I can't open custom stories with a personal menu, I don't know if I express it very well.
The normal custom stories works, these are the custom stories that I put in the folde of custom_stories of Amnesia, but the custom stories with menu like Insomnia, White Night or Oh Silent Night don't work. I know this custom stories don't work if you put in the folder of custom_stories, but I read, I have to copy the folder of the mod and put them in the redist folder of Amnesia, and I haven't got any redist folder in all the Amnesia game! D:
I have the retail game, it isn't of Steam, and I use Mac... if anyone can help me...
Thank you to everyone!