In future, you should start a new thread with your problem rather than responding to an announcement.
When installing a new update of an extension, you should first uninstall the previous version from the extension manager.
It sounds like you have DW CC, in DWW CC, you also need to install the depricated server behaviors extension.
For DW CC 2014:
http://www.webassist.com/tutorials/Deprecated-Server-Behaviors-for-Dreamweaver-Creative-Cloud
For DW CC:
http://www.webassist.com/tutorials/Server-behaviors-for-Dreamweaver-Creative-Cloud