Can I upgrade my Yahoo messenger?

I have an old version of yahoo messenger and can not upgrade?

• when i click on please upgrade to latest version i get an application not found notice, and the same happens when I try to cvlick on any links my friends I chat with send me in messenger

• Answer:

  ANY Yahoo! Messenger program will not install properly if a former program, or an incomplete install, has not been completely deleted from the computer first. (Don't worry - your Contacts List will be saved into the fresh installation of an updated Messenger if you save the profile file!) Use the Control Panel > Add/Remove Programs method, then double-check by going to Start > Search > files and folders > Yahoo! Messenger (notice the exclamation mark in the title). Write down the file path and delete all references manually if necessary. Delete all Yahoo Messenger references from the registry. You can use the safe registry editor in the CCleaner program for this too. The uninstaller works well for Vista and Win 7, but not for XP - it leaves behind MANY junk files when uninstalling. Download and SAVE the program directly from the File Hippo web site. Install it only AFTER completely cleaning the registry of remnants. Download the most recent version of any Yahoo Instant Messenger (highest number, top of its list) Since Messenger 11 is still new, you might prefer the earlier versions listed on the right of the page. You must be operating as an Administrator to install the program. Some firewalls have issues with installing Messenger from the Yahoo installer site, but disabling your firewall while online is VERY dangerous! Usually, by installing after downloading, the firewall will ask for permission to run the program. If you use Internet Explorer 8 or 9 as your browser, Yahoo Messenger 10 or 11 will not work properly without updated Flash and Java programs also installed, and possibly the .NET framework update.