Here's the GSX Pro Profile for the PMDG DC-6A. There was already a profile for the DC-6B, but for those of us who like to fly cargo this is the one you need.
To install move the PMDG DC-6A folder into your %APPDATA%\Virtuali\Airplanes folder (press Win+R and paste the path in there if you don't know how to find it)
BigSierra