I’ve been getting this as well, and, with the holiday, I’ve had some free time, so… I wiped my disk, reinstalled Windows 11 Pro, reinstalled the latest game-ready NVidia driver for my RTX3080, reinstalled Flight Simulator, and it hung on the startup dialog page that confirms your package path and which has the Update button.
I quit the hung process with Task Manager, relaunched, and it’s installing now… for now, that is.
This is as close to a bare config as I can get - Core i9-10850K, 64GB RAM, 2TB NVMe SSD, Windows 11 Pro, nothing other than my password manager and Microsoft Office installed.