Florida Everglades visit with a Nikon D2h

I was asked to process one of my images in DarkTable, to compare with what I do using PhotoLab 6. All the photos from this trip to the Everglades were shot with my very old Nikon D2h, but PhotoLab refused to open half of them:

I understand this, but why did the first half of my images open fine, while the second half displayed this message? I have no clue.

Anyway, here is one of the images that I processed in DarkTable:

I suspect that DarkTable lacks all the tools that PhotoLab provides, but other than for my ignorance in knowing how to use DarkTable, I have no complaints.

(And it really bothers me that I can’t open images from unsupported cameras, including my Leica M8.2, unless I edit the EXIF data and replace the camera name with a supported camera name. Why won’t PhotoLab do the best it can, and open the image anyway??? I want to get back to doing infrared photography in the near future, and the only camera I have that can do this is my old Leica, an then I either need to “cheat”, like before, or use DarkTable. DxO should issue a warning message about an un-supported camera, but open the image anyway, which I know it can if I “cheat”.)