The most downloads for a single piece of software in 24 hours is 8,002,530 for Mozilla's Firefox 3.0 between 17-18 June 2008. This 'Download Day' marked the launch of the new version of the Firefox web browser.
Mozilla Firefox is a free web browser that is developed by a team of volunteer programmers throughout the world. The Mozilla Foundation is a non-profit organization that seeks to promote open-source software.
Please note: Comments below may relate to previous holders of this record.