Did you uninstall the previous version before installing the new one?
it sounds like you had installed the new version over the previous version.
Locate the users configuration folder, for details see the following page:
http://www.webassist.com/tutorials/Common-installation-issues
when you locate the configuration folder, rename it.
then restart DW to recreate it and close DW. now open the extension manager, remove the extension and reinstall them.