Hi again
I don't think it's MSC simply because the final MSC.Nastran for Windows was v2005 and that came with Femap v9.0. I'm not absolutely sure but nearly. I think the demo needed some kind of temporary license file. An e-mail to MSC was required (I think) and that door is prabably closed today since N4W no longer exists.
If it's NE it should be possible to run. Or contact NEiSoftware to get a new demo version. As far as I know it still exists. I have a demo option on my Femap at least.
As for NX, I don't know. But since Femap has a demo option I can't see what NX Nastran shouldn't have it as well. But I don't know for sure.
Regards
Thomas