Hey there! You will need to contact Steam to see if they are willing to do an upgrade. If not, you will need to ask for a refund so you can get the Deluxe Edition.
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Yes, that was my first thought! What I found out is that Destiny 2 support page on Steam refers to Bungie support. What a surprise, never seen that with other games on Steam! So yeah, seems like a refund is the only way to go. Thanks a lot!