During installation, you will be asked for the "Data Path." Do not use default Program Files.
The ASHRAE Duct Fitting Database is a vital resource for HVAC professionals, as it provides:
Efficient HVAC design relies heavily on accurately calculating pressure losses in ductwork systems. The is the industry-standard software tool used by mechanical engineers, HVAC designers, and estimators to determine the loss coefficients of various duct fittings.