How to download and install the current mfs version only, without d/l all the ingame updates again?

This works for the microsoft store version. I dont no if it works for the gamepass version.

Copy your 2020_package directory (that contains the 90 GB or more) to a extern drive or USB. Uninstall msfs
Install Msfs again. It only downloads 1 GB.
Copy back your package directory
Start MSFS
Make sure you point the package_installer to your copy package directory.

Good luck