The nsfw_archive.rpa file comes inside a directory titled 'game' to show you an example of the file hierarchy (how it looks when installed correctly). You need to go to where you installed the actual game, not the patch, and find the 'game' directory there. Move the nsfw_archive.rpa file into that directory. You will know you have the correct directory because it will have archive.rpa (the non-nsfw one) inside it.