It seems you are looking for a file to download, likely a model, skin, or add-on for a flight simulator (like Rise of Flight, DCS, or Microsoft Flight Simulator) regarding the aircraft. Here are the best ways to find the SPADXIII zip file:
: If this is for the dedicated RoF sim, the official forums or website are the best source for official or community updates.
: A major forum for prop-sim enthusiasts, featuring a massive file library for older simulation titles.
Which is this for (e.g., Rise of Flight , DCS , MSFS )?