Are you having trouble finding the "sysdata" folder, or are you getting a specific error code when you try to launch a game?
Let’s fix this permanently.
While Citra is 100% legal, distributing the keys themselves is a legal gray area. This is why the emulator doesn't come with them pre-installed. The "Citra AES Keys.txt Download Fix" (Step-by-Step) citra aes keystxt download fix