: Tools that "trim" ROMs to save space often remove the DSi binary section as it is seen as "extra" data.
No. On 3DS, you typically install TWiLight via CIA (which appears as a gift box on your home menu). If you get the error on 3DS, you likely installed the CIA but did not copy the _nds folder to the root of your SD card. The 3DS needs those assets on the SD card even though the app appears on the home menu. twilight menu dsi binaries missing install