Just remember though, that the hardfile will contain its own dh0: and dh1:, so if you already have an existing AmigaOS setup (you mentioned AmigaForever, so Im assuming you're using that AmigaOS system?) you may end up with multiple devices with the same name. There's an lha archive of Louises setup as well I beleive, which should make things potentially a little easier, but even without it you just need to grab the ADE folder and copy it to wherever you like on your own AmigaOS setup. From there just edit the ADE-Startup file and change any paths that differ (its using IconX by default so you'll need to 1st open up an editor rather than just double clicking).
Im dont have it in front of me at the moment, so cant be more specifc/exact in details, but hopefully there's enough info in there to get you going. Feel free to ask any more questions though, or for clarification on anything that's not clear.
p.s. Alternatively you can just use the .hdf as is, as your AmigaOS system. It's fairly basic for most things, but quite nice for developing with (albiet a little dated now). Bare in mind it's probably not legal (due to containing amiga os), but I'd be surprised if anyone kicked up a fuss about it, especially if you own legal versions of the files in question (which you would if you owned AmigaForever(or other non copied versions of amiga os files)).
