I found my problem. It was that I unzipped the 2 installer files to the wrong directory.

I incorrectly installed *in* the directory .\City Navigator North America NT 2012.20.gmap

After I reread *carefully* I moved the 2 install files to the directory that contains .\City Navigator North America NT 2012.20.gmap (1 level UP)

Success. And thanks for the support!