Same here. I bought the Phenom 300 a few days ago. The installer is v1.3 but it's not possible to install the in P3D v3. The option is not available. Using the browse option to point to the P3d v3 directory H:\....\Prepar3D v3 results in an installation on C:\Program Files(x86)\Carenado installer... and no aircraft in P3D.
Now waiting for a solution by Carenado.