For what it’s worth; I just built a completely new system today. Installed MSFS the first thing I did.
The specs are
Ryzen 9 5950x
64GB RAM
RTX 3090
Windows 10 Pro
Installs fine, downloads everything fine.
Load bar goes almost across the display… and… crash to desktop!
PLEASE, Asobo, Microsoft, someone… Let me delete whatever is saved in the cloud, just in case it actually works.