Downloading iFly 747-400 for Microsoft Flight Simulator X 1.1.0.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the free program is iFly Developer Team.
This free PC program was developed to work on Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 or Windows 11 and is compatible with 32-bit systems. The following versions: 1.1 and 1.0 are the most frequently downloaded ones by the program users. IFly 747-400 for Microsoft Flight Simulator X belongs to Games. We recommend checking the downloaded files with any free antivirus.
From the developer:
FSX iFly Boeing 747-400: iFly 747-400 V1.1.0.0 for FSX. Extreme detailed cockpit with fully simulated FMC. Complete TCAS simulation with audio and visual TA and RA system. Fully simulated Inertial Reference System. 90% of 3D fully operational buttons in VC mode. 3 model configuration for better performance. Includes with seven liveries.
You may want to check out more software, such as Aircrafter - Aircraft Manager for Microsoft Flight Simulator X, Microsoft Combat Flight Simulator or Airwolf X and Redwolf X Addon For Microsoft Flight Simulator X, which might be similar to iFly 747-400 for Microsoft Flight Simulator X.