ORIGINAL: Abaco24
I'm gonna ask Hangar 9 for some help I read that I was supposed to get a discount on upgrading to Real Flight but I missed it in the box I guess.
Real Flight is distributed by Great Planes, which is Hangar 9's competitor. There definitely is not an upgrade path from the p-51 PTS sim to Real Flight.
Hangar 9 is releasing a standalone sim "FS One" in mid July to compete with Real Flight. If an upgrade exists, that's what it will be.