John,
Doug H was able to get the last files and the sourcecode for Cnc Pro and they presently reside on his mostly vacant web site:
http://www.crankymachinist.com/cncpro/
Have fun. There have been some discussions on the old Yeager Automation yuhoo group as well as on the CNCPRO group.
If you are not a member of these groups, you might want to investigate as some modded files were put up on the cncpro group.