Idk if you're using Ryujinx but I'm gonna assume you are. So the instructions for installing on Ryujinx say to replace the 'contents' and 'exefs_patches' folders in the Ryujinx 'atmosphere' folder. You can do that first for the Yo-Kai Watch 4 English mod. Then to also install the Yo-Kai Watch 1...
I was confused at first too. Since this mod only works with version 2.2.0 I acquired that update NSP. I updated the game in Ryujinx by right-clicking the game icon and clicking "Manage Title Updates", then "Add" and navigated to the version 2.2.0 NSP file. Make sure you have it enabled by...
sorry, beein trying to find this file that's been right in front of me for a month now, only to find broken links, and google to prove that it's completely worthless.