All users of Prosim A320 are on the lucky side of 64 bit simulation. As Prosim A320 is mostly based on simconnect it is 99% compatible to the new 64 bit Prepar3D.
As Prosim-AR stated on their Facebook Page:
Finally we’re allowed to tell you about this exciting development! As you may know in a week from now Lockheed Martin will release Prepar3D version 4. ProSimA320 is 99% compatible already today. For ProSim737 we have a bit more work to do, expected to be done in August or September, no additional charge.
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