What it certainly means is that they cannot put them on a public website /torrent / etc.
The advantage of coming to this place to get them links them in to a place where they will be supported and know where to find updates.
BTW. 1.6 G is rather less than the average film (or say ~2 iPlayer episodes), and there are many more hours of entertainment in these….so why is such a one-off download such a big deal?
Even in the sticks, on 2M broadband, you just walk away and do some weeding, and then come back and it’s done…