Due to the many problems with the most recent versions of the Extension Manager, I posted an article today to help users understand the process of installing extensions -- especially the numerous problems that occur when you have two versions of Dreamweaver on your system. Also in the article are solutions to a few common problems with the installation of extensions. Hopefully it will help a few users who have problems: http://www.tom-muck.com/articles/ProperCareAndFeedingOfTheExtensionManager/