Hey there, JawaharBhalla
Welcome to the Microsoft Community forums. I am Nathan, an Independent Adviser.
As far as I understood it if you have bought the Premium Deluxe Edition, you should download that version from the store here:
https://www.microsoft.com/store/productId/9PMDB...
The store should take care of the rest, and install what it needs to install.
There is an installation guide the developers have published regarding this game here:
https://flightsimulator.zendesk.com/hc/en-us/ar...
Hope this helps,
Regards,
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The website linked above is an official website for the game developer Asobo Studio. While this site does not belong to Microsoft, it is a trusted source.