OK, that's helpful. When you bought the Wedding Story here on itch.io, it should take you to a page where you can download the "dlc_wedding.rpa" file. That should let you download that file either to your "Downloads" folder on your PC, or to a place of your choice. Once you see that, you have manually put that file in the "game" folder of the main game, wherever you have that. The main game should be in a folder labeled "OurLife-1.7.11-pc", and inside there is the "game" folder you need. Let me know if you are able to locate the "dlc_wedding.rpa" file, and if you need more help getting it into the right spot!