To the OP:
Check to make sure that you have the most current version: Capture NX-D1.4.3
Richard: the trouble was with the Transfer 2 element of ViewNX-I, this issue has been resolved in the current version: ViewNX-i 1.2.4. Btw, Transfer 2 is not integral to C NX-D but was with C NX2.
To clarify, Nikon's download site usually directs Macs and PCs to the appropriate download. I assume this is done based on a handshake with the browser, much like websites tailor the content depending on whether you are on a mobile or a laptop.