This helped. For me the average download speed must have been in the kB/s. Most the time it was not downloading anything at all.
I have not even restarted the launcher yet and it has been up at 50MB/s. Still does stop and then have some 5-10MB/s and I have not seen it reach 100MB/s but maybe that will happen after I restart. But so far I have downloaded the last 15% in about 5 minutes while the first 20% took about 2 hours. Its a total of 20-25gb… it really should not take more than 20min to download on a 1gbit Internet connection. Should take a lot less than that. But now at least it has progress 
Edit:
Nope, that was celebrated too early. I restarted the Epic Launcher, I restarted the download and it sent 10-15 minutes just to figure out that it had already downloaded 35%. Now its at 45% and most of the time its not downloading at all. Another 2 hours have gone by. 23gb download and Epic, the ones who run the servers for the Epic Store, cannot even provide a 100mbit stable download speed for their game engine? I guess it probably is some kind of network issue, but its pretty hard to consider getting into Unreal Engine when these things work so badly. In the engine itself multitasking also seems to be a pretty big problem.
Who knows, maybe tomorrow I can try the editor if it has finished installing, but at this rate I should probably not expect it to be done by then. I have installed several versions of Unity and I figured it seemed pretty slow for it to take 1-2 hours to install the engine, but now that seems like a luxury compared to this.