That's a sad state of limbo! OK, I remember this being a bit goofy when I played this last year.
And the disks should be copyable, because they encourage you do to do so.
However, note the screenshot of the manual:
- Handy installation notes - oh so handy!
Truth is that they should have fixed this from the code side, and not put it upon users to fix themselves. Kind of lazy if you ask me.
So basically you have to
fix the install names by hand as you install to HD. Makes total sense, right?