To download transaction data over a specific range of dates, you will need to go to the "Dips Over Time" section. The bottom of this section includes options to set a custom date range for which you'd like to view your transactions. Set the date range (up to two months) for which you'd like to obtain this custom donation report. Once you've set your chosen date range, you can click on the CSV button in the top-right of the chart and it will download the dip data for you.