Are you sure you selected the correct version of P3D during the installation of my software?
you can add it manually otherwise, add that:
<Launch.Addon>
<Name>Simpatch</Name>
<Disabled>False</Disabled>
<Path>c:\A320FMGS\SimPatch\Simpatcher.dll</Path>
</Launch.Addon>
Of course you may need adapt to adapt the path...