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OK, I looked in DLC's there's nothing there.

EDIT: After patch today it's now there.
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capture.jpg (56 Kb)
Post edited October 19, 2022 by MadeUpName556
I did not find it either. It must be an error. Hopefully they fix it.
same issue. I contacted GOG support asking them to add it to my account.
At 5am Mountain Time in the USA (2 hours 20 minutes ago from now) I got this reply from GOG

Hello,

Thank you for reaching out to us. We are aware of the issue and we are working to get it fixed as soon as possible. Please note that we will make sure you receive the pre-order DLC you paid for as soon as possible and I apologize for the inconvenience.

And just 10 minutes ago I got a 0.1 MB update for the game, which was the Protector Pack DLC. So the issue has been resolved.