Download Counter Pepper
By orderedlist

Does pretty much what it says. Counts downloads. Does so with some JavaScript trickery, allowing you to choose file extensions to track (like .zip, .mp3, etc.) so your downloads can be anywhere in your file structure. No edits or alterations to your site or server neccessary. Install, activate, choose your file extensions to track, and you’re all set.
Release Notes
All versions- Version 1.31
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Bugfix: If you were getting a ‘headers already sent’ error while downloading, this should take care of that.