You can not download Winamp after Dec 20, 2013 because AOL is shutting down Winamp website and download of its media players also. Now is the time to download Winamp latest and last version that is 5.66. When you visit this media player’s download page now you’ll be greeted with following warning.

"Winamp.com and associated web services will no longer be available past December 20, 2013. Additionally, Winamp Media players will no longer be available for download. Please download the latest version before that date. See release notes for latest improvements to this last release.
Thanks for supporting the Winamp community for over 15 years."

Winamp

You can download Winamp 5.66 from here.