That's the first public beta, not the final release, so unless PMDG was/is a member of the team that tried 10.50 in the private beta test it's hard to tell if the DC-6 is 10.50 ready.
Kyle stated that there're no external plugins because all is developed in-house, this mean that they compiled their own code and if Linux is not supported I assume that there's no working Linux version.
Tried again right now and same error, at this point seems to me that you have to be a member in order to see that.
Oh, well, as I'm not a member of that site I'll wait to see images when them will be available through other channels.
Hello, seems indeed a missing library(ies) problem, but you should attach the whole log.txt in order to check the problem not only a little piece of it.