I got my d/l link from the post here about CNX 2.3. I downloaded the 64Bit MAC version and purchased a key from Nikon. Works great. Shows as version 2.3.0. MBP shows 10.7.2
Here is the NR entry from December 20th: http://nikonrumors.com/2011/12/20/nikon-capture-nx-2-3-0-64-bit-and-view-nx-2-2-5-released-today.aspx/
HTH
Later,
Jeff