ive been trying to install the game on the itch.io app but it doesn't let me..weird numbers and letters come out in red..ive tried to download it here and it still doesn't let me
Just so that there's no misunderstanding, have you successfully located the "game" folder and attempted to install the DLC using the instructions listed on this page? Or are you trying to use the Itch app to install the DLC?
If possible, please provide a screenshot of what your "game" folder looks like (alongside the DLC's folder as well if you've already installed it there).
Sorry for not being clear, but I need a screenshot of the base game's "game" folder (i.e. the main 14 Days With You folder). Could you try right-clicking on the base game and see if that helps you find the folder?
Once you've located it, you can then place the "14 Nights With You" folder inside it (the folder you see in your screenshot).