In an announcement on their forums, Leonardo Software House has revealed that Navigragh has released a brand new AIRAC dataset for their Fly the Maddog X 64-bit edition aircraft. (Fly the Maddog X (P3Dv4.x and above).
It must be noted that the 1.4b414 version for P3D v4.4/v4.5 is already compatible. Installing the new dataset now gives users the opportunity to fly ARC-DME procedures.
You can manually download the new dataset right away or you can re-scan your addons within the Navigraph Data Manager and it will automatically recognise the 64-bit aircraft.