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WaterCAD 10.3

WaterCAD is a robust and comprehensive water distribution modeling program that can be customized with additional modeling platforms and modules as your modeling requirements grow....

— I have an old version of WaterCAD v6.0. Is there an upgrade or do I need to buy the new version at regular cost? How many pipes can I model on this latest version?
I haven't any kind of water cad software please it is best and simple to use