Those of you who purchased the PMDG DC-6 through the MSFS Marketplace, will not get the PMDG Operations Center. The OC is required for installing liveries saved as PTP. It seems like a lot of the downloadable PMDG DC-6 liveries at flightsim.to are uploaded as PTP files.
I've got a few requests for uploading liveries prepared for direct install into the Community folder. Well, I've only uploaded 2 liveries of the DC-6B to flightsim.to. The Braathens Safe LN-SUB ("Social Distancing") has been converted and re-uploaded as a stand alone livery. But I can not do this with liveries that others have painted and uploaded. So I suggest that those who have uploaded DC-6 liveries as PTP files, consider to upload converted files for direct install to the Community folder (at least on requests)