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Dear GOG, if I already own a game's DLC, for example purchased the "deluxe" or "goty" edition, please mark the DLC and expansion passes as "in library" in the store. Thank you.
Might want to throw a vote on this community wishlist entry:
https://www.gog.com/wishlist/site/goty_should_mark_main_game_and_dlcs_as_bought