OSDownloads

OSDownloads is the easiest way to add downloads to Joomla. OSDownloads gives you an flexible and reliable Joomla downloads directory. OSDownloads can store and share files on your computer and on remote services such as Dropbox, Box.com, Google Drive and Amazon. OSDownloads also integrates directly to MailChimp and Constant Contact so you can collect emails in exchange for downloads. You can use OSDownloads to increase the number of your newsletter subscribers. Or you can just have emails on file so that the users who download can be contacted later.

www.joomlashack.com/joomla-extensions/osdownloads