No big changes really, other than the fact that there is now a button for swapping attacker and defender so that people can see how the odds changed if the roles were reversed.
For more information about the program, see the original post about it.
Requires Java to be installed. Link for that here.
SourceForge Page: http://sourceforge.net/projects/aa40battlecalc/
Source Code: http://sourceforge.net/projects/aa40battlecalc/files/Battle%20Calculator%20Source/v1.0/src-v1.0.zip/download