NIKON CAPTURE NX D MAC SOFTWARE
It's confusing because what happened is that Nikon used to get its software from Nik (coincidental name, I think) and that relationship ceased, so they had to find new authorship, and although many features remain similar, the software changed. Capture NX-D does have some new features that make it useful, such as better noise reduction, sharpening, etc., and it's not a bad thing to have that around. If View NX-2 does what you want, and you can make it work, I'd skip the newer version. But be careful, because View NX-I may overwrite a working copy of View NX-2 unless you take measures to prevent it. You might check around on the web and see if someone else has found workarounds there. I have no Mac, but it looks from some cursory browsing as if Nikon software has problems with some operating systems, but the problems are more in the downloading than the running.
Editing files on the memory card itself can occasionally go wrong, and lose images, so if you can download the files to the computer and read them there, you're probably better off anyway. It's not a bad idea to copy all your files to the hard drive first anyway, and then to edit the copies. If you have an installed version of View NX-2 that works, one other thing you might try is to use the memory card in the computer, if you have a card reader, and see if that can be read.