If you absolutely cannot pay for version 6.00.05, and you refuse to pirate, you are not out of luck. Several open-source and free alternatives can perform nearly the same calculations, though they lack the official ASHRAE branding.
Historically, engineers had to manually look up "Dynamic Loss Coefficients" (C or Co) using printed tables and complex interpolation. The database changed the game by offering: ashrae duct fitting database 6.00 05 free download
: The tool is primarily used to calculate the ESP required to overcome resistance in the duct network, which is critical for selecting the correct fans or Air Handling Units (AHUs). Comprehensive Fitting Library If you absolutely cannot pay for version 6
Some software vendors (e.g., Elite Software, Trane) include a licensed DFDB runtime when you purchase their duct design modules. and you refuse to pirate