Whee! Aurora Wing Chapter 1 Beta (not for public release, yet). Two files:
You'll need both files and WinRAR (possibly you might even need version 3.0 specifically) to unpack this.
Map0006.lmu (battle 3)
Map0009.lmu (battle 4)
These are easier versions of battles 3 and 4, as demanded. I'm not quite sure how much easier it'll work out to be, because I haven't played these maps myself yet.
Oh, yeah! Here's a reasonable pre-battle 3 save, too, in case you need one. (I consider it reasonable, at least, because it's what I have after playing the first two battles.) Save04.lsd