It is version 2006. even though the splash screen says ver 16. I believe FTM started using the year reference in 2005. The dist sleeve says 2006 as does the help file. And it is installed (at least on my machine) in C:\Program Files\Family Tree Maker 2006\
2005 is version 15,
2006 is version 16,
--------------------
2008 is version 17
2009 is version 18
2010 is version 19
2011 is version 20
2012 is version 21
current release is 21.0.0.723
2005 is version 15,
2006 is version 16,
--------------------
2008 is version 17
2009 is version 18
2010 is version 19
2011 is version 20
2012 is version 21
current release is 21.0.0.723