Slow install speeds of the last file (528/528)

Okay, I had to reinstall MSFS because of steam verify game files button. It all went fine, but on the last file (package ?) It´s super slow. I have 100mbit/s in my house, it downloads at about 3mbit/s. Sometimes, it spikes to the correct speed for a minute or two, downloads 1 or 2 GB, but that´s all and back to the slow speeds. It would take about 15 hours like this and I don´t want to wait that long. I tried everything I could find (vpn, cmd commands, windows update download settings, google public dns and a lot more)
I´m desperate and sad. Do you have anything that helped you ?
Thanks.