However, as with previous version of Yahoo! Messenger, it’s possible to download full complete standalone installer setup file for Yahoo! Messenger via a direct download link. This stand alone setup program can install Yahoo! Messenger offline, and will install straight away without downloading anything extra. It’s the same file that the small Yahoo! Messenger setup initiator downloads if you download the ‘partial installer’ from Yahoo!.
Yahoo! Messenger Full Installer verson 18.104.22.1683 – ymsgr810_413_us.exe (no longer available)