Install the three SimConnect.msi by double clicking on them in order:

1-RTM/Simconnect.msi
2-SP1/Simconnect.msi
3-XPACK/Simconnect.msi

4-Reinstall FsPassengers


Prepar3D NOTICE: It's normal that the installer's title is "Microsoft Flight Simulator X". Prepar3D use the microsoft version and you can find those installer also in your Prepar3D installation ("redist" folder).