I repeat what I said in the Port forum:
Originally posted by Goober5000
I've never had trouble downloading anything. Maybe if you're on dial-up it would be different, but I can always start the download immediately.
And if you look on the Port website, you can download the full voice pack and the full command briefing pack, as opposed to smaller chunks of either.
It's done this way to make updating easier for everyone involved. To just play the Port, you only need to download one file. To get the full experience, you need only download two additional files (voice and CBANIs). And these are provided in both single and multi-part download format.
The other downloads are extra. The hi-res interface stuff isn't needed if you run in low-res, the hi-res ship textures are merely icing on the cake, and the music VP isn't even officially supported yet.