How to Fix Launcher Issues
Game Downloading Slow / Stuck
This is an issue where the game skips the package installation process and goes to the loading process. I found this issue when selecting a custom install path for the game packages.
To fix, keep restarting until you see a button that says "update" you should now see a white progress bar that displays the percent and the current asset status.
Launcher Stuck at "Please Wait..."
This is when your launcher is verifying the download.
To fix, delete your packages folder if you selected a custom install path, and/or delete C:\users\'USERNAME'\appdata\roaming\Microsoft Flight Simulator\, and uninstall and reinstall your game launcher via the steam right click context menu.
Exe Not Found
When the game was first launched it only shipped with a 256kb steam api .dll
To fix, verify integrity of game cache and redownload the launcher.