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I must have accidentally hit the delete key on my keyboard because the torrent I had been downloading for 30 days mysteriously disappeared from my torrent list.
I still have all the downloaded data in the same filepath, is there a way to resume a torrent that was accidentally deleted from the client?

yeah, if you add it to your client, it will recheck like you'd have 100%. that's the best part of torrent. then it will determine how much you actually have, and then continue the download.