Since the Rapidshare link is dead, I uploaded the last version of Mitra Mod that I had. I don't think it's the latest, but here it is:
http://www76.zippyshare.com/v/39139539/file.html
It has the two extra optional folders for providing extra penalties against archers firing into forest, and for extra movement penalties for cavalry trying to move through same. He included text files for them.
Mitra's mod was really an Unofficial Patch in my opinion. It fixed some annoyances, and improved some of the stuff under the hood. I recommend it.
(Note that this earlier version may not have all the campaign adjustments of the final version.)
EDIT: If anyone has the latest version, please upload and post it here. Thanks!