: Before starting, ensure DirectX 9.0c is installed. If using the original CD, run dxsetup.exe directory. Run Installer : Execute the setup file from your installation media. Update to 1.9.7

If the game fails to launch on Windows 10 or 11, you may need to install the DirectX End-User Runtimes (June 2010) to provide the older libraries the game relies on. USB Dongle Not Found:

The Digital Horizon: A Tribute to AeroFly Professional Deluxe (v1.9.7)