• Online Installer: from YAHOO Official Site
  

  => http://rd.software.yahoo.com/msgr/11/msgr11us.exe

  Note: When prompted, save the file to your desktop & double click the Yahoo! Messenger 11.5 file on your desktop to start installation.

• OFF-Line Installer: from YAHOO Official Site
  

  => http://xh.yimg.com/…ymsgr1150_0152_us.exe

About Yahoo Messenger ver. 9

• Instant message with friends on Yahoo!, or MSN (Windows Live Messenger)
• Make free PC-to-PC calls and PC-to-phone calls for as low as 1cent a minute (plus free voicemail!)
• Instant message with one friend, or conference in a bunch
• Easily add emoticons & links to your status messages
• Send text messages (SMS) to friends’ mobile phones for free
• Show your style Avatars, audibles & IMVironments
• Join a chat room to meet new friends while you discuss your favorite topics
• Use the built-in media player to share web videos & view photos with your friends
• Share securely with automatic scanning for users of NAV (Norton AntiVirus) or Internet Security

Download Yahoo Messenger 9: (direct link)

==> http://download.yahoo.com/dl/msgr9/us/ymsgr9us.exe

Yahoo Messenger Home Page: (short link)

==> http://messenger.yahoo.com/win/