If these are absent, your extraction failed. Redownload the archive.
Developers frequently release fixes for compatibility issues. Ensure you are on the latest version: Installing TWiLight Menu++ (3DS) - DS-Homebrew Wiki twilight menu dsi binaries missing install
TWiLight Menu++ acts as a "frontend." When you try to launch a game or use specific DSi features, it looks for small pieces of firmware code (the binaries). If these are absent or corrupted, the system fails to bridge the gap between the menu and the hardware’s DSi-mode registers The Fix: Manual Installation If these are absent, your extraction failed