All flight recorders with USB-chis manufactured by FTDIchip (e.g. Flymaster, Renschler CoMo,...) require up tu date drivers for full compatibility with MaxPunkte. Typical error messages with old drivers are "D2XX dll error, FT_GetComPortNumber missing" or "GtetFTComPortNo - General IO error".

Please update the driver from the chip manufacturer homepage. Details see here, the issue does not only apply for the Flymaster