You know what i will see what i can do
edit: listen when i look at the picture it is obious for me what to do
If you can give me a link to the custom mode, i will make a video just for you to how to install the mode
because i can tell you with words, but im not sure if you understand

An Amnesia Custom Story isn't a brand new game with a custom launch, thus White Night had a custom launch but only as a .bat file while it would still need to be in the proper folder.

To play a custom story for Amnesia move the "Finding Them" folder into your C:\program files\steamapps\common\amnesia\custom stories\

Thats why i said i can tell you with words, if you still down understand i can make you a video, but just say the word
Edit: yay i made it to 200 posts