For me and for other people in a german livestream this worked:
- klick on the gearwheel next to the download.
- Then go to installation & updates and type in 200kb/s
- type in 0kb/s for unlimited download
repeat step 2 and 3 till you get to around 4-8 mb/s. This isnt that fast but at least its many times faster then 100kb/s.
You should do that about 5-15 times. Then it should work. Note: This may not work for everyone.
in addition this may work for some gigabytes. I experienced the download speed to go from 8mb/s go down again to 100kb/s after 3-5GB. You just need to do the 3 Steps again in order to get this to work again!
Hope this helps. Have a nice day.