Series 1, Episodes 4 to 6 with 20 minutes of extra material.
Longer than the TV shows by 20 minutes and also containing material cut from the later DVD release. This is from the VHS video 'Red' (the one with the blue cover).
I asked Otis and Marvin how much you should seed and they said: "Please seed at least twice as much as you download, as it'll help pass the time while we wait for these ships to come in and out of the dock of the bay.".