The emulator provides a direct way to see which folder it is currently using for its system files (including keys):
If you use Portable Mode, the option will instead open the folder where Ryujinx.exe resides. ryujinx prod.keys location
The prod.keys file must be placed inside the folder within your main Ryujinx directory. The fastest way to locate this on any operating system is to open Ryujinx, go to the top menu, and select File > Open Ryujinx Folder . Exact File Paths by Operating System The emulator provides a direct way to see