I don't buy the whole "because it's busy" thing. I believe the downloader built into the launcher is broken. End of.
Back in the early days of beta for the original product I used to get good download speeds. At the same or similar time there was a problem jumping in and out of super cruise and the answer was to mess about with the MTU setting on your router. Then it got fixed and people no longer complained about the MTU thing. At some point around then I noticed my update download speeds go through the floor.
I'm now sitting here on an 80Mbit fibre link that usually downloads from big suppliers (Apple, Steam, etc.) at 8MB/s, even 9 sometimes and yet ED:H is coming down at 0.06MB/s. That's dial-up speeds. If it genuinely is "because lots of people are downloading it" then add extra download capcity. It's not like the launch of the new game came as a surprise to Frontier.
Anyway. No point in having it download that slowly. I'll come back to it some other time. But the last few times this has happened to me I ended up not bothering. In fact, thinking about it, I've not properly played this game since Beta which is a shame as I liked it then.