Not surprisingly, it was hard to connect to Microsoft servers and download the update in the first hours. Anyway, you can try to update directly over your current MSFS install. But in case of issues at launch after the update, it’s recommended to uninstall all files and proceed with a clean and full install. Here’s another link, for the Known Issues updated list.
Patch Version 18.104.22.168 is available in 20 minutes (10am PDT)! For those with installation issues, please check out this post for best practices on how to install the latest update.https://t.co/IvpyUSUcXU#MicrosoftFlightSimulator
— Microsoft Flight Simulator (@MSFSofficial) September 2, 2020