Restart the simulator, and the airport will be upgraded automatically.

Custom vegetation and surrounding landmarks to match the mountainous terrain. Download the .zip file from the official Flightsim.to page.

Extract the folder named lfsj-rivierascene (or similar) from the zip. Drag and drop that folder into your MSFS folder.

The file refers to a custom scenery package for Microsoft Flight Simulator (MSFS) featuring the Chambéry - Challes-les-Eaux Airport (LFSJ) in France.