Search the DCS World User Files (official site) or the Eagle Dynamics forum under "Mods and Apps." Look for "VSN YF-23" or "Community YF-23." Avoid sketchy third-party uploaders.
Because this is a mod, not an official module, installation requires manual intervention. dcs yf-23 mod
However, if you demand study-level fidelity (clickable switches, realistic RADAR profiles, and accurate damage modeling), stick to the official F-16 or F/A-18. The mod is a shell—a very fast, very stealthy shell, but a shell nonetheless. Search the DCS World User Files (official site)
You must own the F-15C Flaming Cliffs (or the full Flaming Cliffs 3/4 package). Installation Path: Download the latest F-23A Spectre package . not an official module