When this first released I installed it in the first attempt (despite the needlessly complicated launcher) and was able to run it consistently. Then they did an update that always gets stuck decompressing and I haven't been able to run the game since. I've probably tried to install this a few dozen times now, following "solved" methods posted online. I'm absolutely sure it's a coin toss and the "solved" answers were just flukes at this point.
I tried making my internet slower, I tried removing ram sticks, I tried removing all my drives except the drive I was installing to. At one point I went full-out scorched-earth, formatted all my drives, then did a fresh Windows install thinking maybe one of the many Windows app folder that you can never really get rid of has something to do with it based on another user's "solution". Flight simulator still got stuck decompressing packages. It's not even the same one every time.
This is a brilliant looking simulator that I was very much looking forward to seeing evolve and improve but I can't even make it beyond the launcher and not one tech or Asobo developer has had a real way to fix their installer which is frankly pathetic