From my understanding it is not possible to run Pix4d or Litchi on the P4P+ V2.
Works fine on the V1 but the required hardware connection between the USB and mini USB that enabled the V1 to operate these apps has been removed in the V2.
A shame as I recently had a V1 destroyed and I replaced with V2. Now need to purchase a 300L controller to run those apps for Survey work.
If I do find a solution I will post here.