I'm hijacking the thread because I recently bought a new computer and have returned to the hobby. I have nearly the same issue, but much worse:
I'm trying to install the X-Plane 11 Demo but after several weeks I have given up, it always stalls in the beggining or doesn't even start sometimes. Even tried VPN, no go. My conn is a 200/100 Fiber, with amazing speeds everywhere. Don't use AV and my firewall is letting me even download Ubunt via torrents, so don't blame my machine.
Seems this issue hasn't been solved for 1 year now, so I guess I'm gonna take my money somewhere else, P3D or something else.