As an exception to most grids where users can click to download the data in CSV, the history grid does not currently have that option. At this time, the process to export the history of a card is a bit manual.
To access card history, navigate to the card list, and click the history icon.
Instead of a download button, click CTRL-A. OR you can manually highlight all information on the screen (left click/hold and drag your mouse over the information), then right click to select "copy".
Open Excel and paste special ("Keep Source Formatting") into a new sheet.
