You are probably using IDKit PC SDK instead of IDKit PRO SDK. Look at DLL version of IDKit.dll. If it's *.*.2, it is IDKit PC SDK. If it's *.*.3, it is IDKit PRO SDK. The DLL is looked up in standard Windows DLL lookup order. To ensure choice of the correct DLL, copy correct versions of both IDKit.dll and Innovatrics.IEngine.dll to the same folder where your application's executable is located.