As others mentioned, if you have the base version already, the upgrade will do but if you don’t have the simulatore at all yet, you need the full version. If you want the Premium Deluxe or any other version depends on your likes. If you want to fly one or more of the planes included in there that are not included in a cheaper version or want to fly to one of the additional airports included in it, go for the premium deluxe, otherwise you can go for a cheaper version. The game itself is the same.
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