Now for the warning, this is my first attempt at doing battlesets and exporting same with scenarios. That means if you look at it and have feedback that is useful (can be also rude, just has to be useful as well) email me donthomas@gmx.com.
Now you might well know better than me how to install this but the following is what I think you do.
unzip all into a sub folder of you HCE main folder, call it say "aust1".
If you have "hdsu.rsr" and "hdsu.res" files in your main folder, copy them to a backup battleset folder or simiilar.
copy my hdsu files ( from "aust1") to your main folder and the new battleset should appear in the window for selecting new games, and there should be two scenarios in the next window.
I've included the files for the battleset and the scenarios in case you want to play around (improve) the stuff.
Fingers crossed and remember to let fly with your constructive criticism.
Hope you enjoy them.
Don Thomas