To my knowledge, gps babel tools are not working correctly with version after S&T 2007 (no 2008 and 2009 support).
Generally, from most of the software i have seen in my life, there are very few that can allow back reverting to older version of the software data files. Most of the time, it is very difficult because new software have new feature that were not there in the previous versions and that cannot be converted back without loosing these new features...
One workaround is to create the original copy in the older version, and import it in the new version. Keep the older copy as the master copy if possible and share it between users.