Well, xdelta is pretty easy at least.
Put the old and new version in same folder, put the xdelta exe in that folder.
Then use command:
to create the patch
xdelta.exe -s <source (old) file name> <target (new) file name>
to get the new file when you have the old (this'd go in the .bat)
xdelta.exe <source (old) file name> <patch file name> <new file name>