Build 63 was, indeed, the last one released. It is installed on my systems, in parallel with the latest builds for all versions from V06 through V14. Below is the list as of 2012-07-30:
63 is the last one. I still use it and OPTION /U reports "up to date". Rex will have to chime in and tell us how to get it. I suppose fpefpe could now try OPTION /U; maybe that will bring him up to build 63.