When launching the shortcut to use an OpenFlows product for AutoCAD, a message that says a valid AutoCAD license is not available. For instance, with WaterCAD, the message will say: "There is no valid WaterCAD for AutoCAD licenses. WaterCAD is unloading."
Integration with AutoCAD for Bentley WaterCAD, as well as SewerCAD, StormCAD, and CivilStorm, is subject to an additional licensing agreement. If you do not have AutoCAD integration associated with the license, while you may see the icon for AutoCAD-integrated version of the product on your workstation, the product will not launch. You will need to speak with your account manager to get this feature for your license.
If you believe that you should have AutoCAD integration, try activating the license again. It is possible that the feature was not properly picked up when the product was initially activation. You can quickly see if AutoCAD integration is included by opening the Feature Level Selector (for legacy licensing you would use the Municipal License Administrator and select Refresh Configurations). AutoCAD integration will be listed as one of the features.
Note that Bentley WaterGEMS and Bentley SewerGEMS licenses both come with AutoCAD integration as a part of the license.
License usage with AutoCAD integration