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...