Updates to Data Bridge and eCart will be released in the next couple of days to correct the problem and Design etender and free tools will follow soon.
in the mean time here is an updated copy of the Configuration/Commands/installer_onOpen.htm file that should corrcet the probelm.
copy them to the users configuration folder:
for Windows:
C:\Users\<YourUserName>\AppData\Roaming\Adobe\Dreamweaver CC\en_US\Configuration\Commands
for Mac:
/Users/<YourUserName>/Library/Application Support/Adobe/Dreamweaver CC/en_US/Configuration/Commands