We are sorry for being late to inform you the latest version of Yahoo Messenger 9. At this time on Version 188.8.131.522 (the last post in Messengeroo is Version 184.108.40.2062) would be the latest one that we knew. Of course we offer you to download that version as Standalone Download aka Offline Installer. That no need to connect to the internet to install it.
Download Offline Installer Stand Alone Yahoo Messenger 220.127.116.112
Just download this version at the link below
Download Standalone Yahoo Messenger 18.104.22.1682: Download (14MB)