1) sounds like eCart 5 may not have been properly ubnisntalled before installing eCart 6.
2) We are working on updates for compatibility with DW CC 2014.1
We are doing testing now and should start rolling out updates early next week.
We will do DataBridge, MySQLi, eCart, Design Extender, then Free tools in that order
It may take a week or two to get them all out since literally every interface is being touched and will have to be re-tested.
in the mean time, I have found that it is possible to install earlier versions of the creative cloud apps through the Creative Cloud Desktop Manager, this will allow you to install DW CC until we can update the extensions for CC 2014.1: