Comment 1 for bug 397381

This is quite unlikely to happen, I think - it's just too likely to require time travel. There are a *lot* of cases where changes in the distribution require corresponding changes in the installer, even if they aren't user-visible. I think it would basically never be possible in reality.

I'll keep it open as a wishlist entry anyway in case we ever want to attempt this ...

(I don't think this makes sense at all in the desktop installer, which is by design not flexible enough to install from a network archive as opposed to from the live filesystem it has handy on the CD.)