Exstension Manager

I’m trying to embed a Yahoo map flash using Flash 8 , I downloaded ExstensionManager 1.7 installed it , problem is when i go to Flash 8>help>manage exstensions, the window is blank , the Install Exstrensions is off, can’t be used and the Package exstension doesn’t recognize the Yahoomap and the class actionscript which comes with it. Anyone knows how to get this done?Thanks a lot.