I just went on the troubleshoot today, but as I am on a Vessel limited to a very, very, very shaky Internet Connection, peaking 2.5, middling at best 1.0mbit/s and rationed to 6 hours a day, downloading 6gigs is simply impossible. I already struggle with a 280mb download and have tried for the last 3 Days without success as MSFS just randomly starts looping and takes on average 30 Minutes just to start up, connect, fail to synchronize etc.
It is a real fight just to start MSFS with slow Internet because it has so many failure points that do not tolerate a drop in connection speed.
I have no old Version. It is impossible to get a new one.