Install Adobe Digital Editions, if you haven't done so yet. Then click on the .acsm file. It will open in ADE and place the epub file into your Documents/My Digital Editions folder. Then open Calibre. Then click on Add Book. Then find your Documents/My Digital Editions folder. Sort by date, and the epub file you downloaded to ADE should be at the top. Then you can add it into Calibre.
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