Im not too sure if these are DLC maps, but if they are you will have to download them from somewhere eg. this torrent:
https://dss0.cc/alterwarez/download/pluto_t6_full_game.torrent
Without the full game (including DLC's) you wont be able to play on DLC maps.
I recommend qbittorrent as the download client. Make sure to uncheck "keep top level folder".
Choose your Bo2 directory as download location.
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