How to activate My MS Flight Simulator Premium Deluxe?

User Support Hub Install, Performance & Graphics
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Hello,
I have reload my 10CD with succes (after total PC crash) All is loaded. Win 11 latest version.
But I Do not know HOW TO Activated the game I have a popup to redeem the code I have on my card available with the 10 CDs and an error message "this code has already been redeemed "

Ok What do I do now?
Thanks in advance

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“This code has already been redeemed.” when reinstalling or installing to a new PC – Aerosoft

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You could try going to the Xbox app on your PC, sign in and install the sim from there.
Point the installer to the path where you have installed the discs.

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See also that support article, I guess same instructions as provided in above posts: