The 4.0 version of ZONAIRDemo is provided as a free download on our website. The most popular version of the software is 4.0. This PC software is developed for Windows XP/7/8 environment, 32-bit version. This tool was originally developed by ZONA Technology, Inc. The software is included in Photo & Graphics Tools. The ZONAIRDemo installer is commonly called ZONAIRCommand.exe.
From the developer:
ZONAIR is engineering software used to compute steady aerodynamics of a flight vehicle. ZONAIR employs a high-order panel-based methodology for computation of aircraft flight loads that can include aeroelasticity and aerothermoelasticity effects
A unified high order subsonic / supersonic / hypersonic panel methodology as the underlying aerodynamic force generator
You may want to check out more software, such as 3D Studio VIZ R3, P-CAD 2004 Viewer or Win4D Advance, which might be related to ZONAIRDemo.