Next year the Nirvanair commercial aircraft will change color to a little more classy. Exit the one-color planes and welcome the new, much regular ones. Of course, inside, there's no change. You will still be served by the Hot"stesses" and treated like pashas.
Regarding the installation, you only need to unzip the file directly into your community folder.
I notice that this mod makes the game crash if the other version https://fr.flightsim.to/file/42840/aerosoft-crj1000-nirvanair-8k is installed in the community folder.