Check this report for a quick look at how many times each of the download files in the download library have been downloaded.
Click on each section to expand for more information
From under 'Downloads' choose 'Download Stats'
The report will be displayed in descending order by the amount of times the file has been downloaded.
Click on the name of the download to view the download page. Click on the number of the download to go to the edit screen for that particular download file.