To export all attachmets from a trello card:
Open the Card and Click "Share and More" in the bottom right corner
Click "Export JSON" in the resulting menu
Copy all text that appears on the screen and paste in the box below
This also works for an entire board, just click the "Show Menu" on top right of board.
Then click "More", "Print and Export" and "Export JSON" and copy the resulting text into the box above.
People have used this tool 17971 times downloading 876 GB and 406207 individual files
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without even the implied warranty of merchantability or fitness for a particular purpose.