This market resolves to the month that Nintendo announces that Tears of the Kingdom will have paid DLC (free patches/updates, no matter the size, do not count.) If Tears of the Kingdom does not have paid DLC, and Nintendo announces as much, this market resolves as N/A. It also resolves as N/A at the end of June 2025 if Nintendo still has not announced whether or not Tears of the Kingdom will have DLC.
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Curious why people are betting October; there's basically always a Nintendo Direct every September, and I'd expect TOTK DLC to be announced in a Direct. I suppose it's possible that they'd announce a TOTK Direct just for the DLC, but I'd expect that announcement to be in a major Direct, and it would be sufficient to resolve this market. Off the top of my head, Splatoon 2's DLC, Splatoon 3's DLC, the Mario Kart Deluxe DLC (I think), and the Animal Crossing DLC (I'm fairly sure) were all announced in major Nintendo Directs.