It sounds like you may not have gotten the extensions installed properly. Our extensions definitely work with CC 2015. I use it almost exclusively.
1) You still have to install the deprecated server behaviors... their new one only works with their stuff
2) You should use the DMX Zone Extension Manager to install the extensions (Adobe dropped support for theirs)
3) Make sure you have downloaded the latest version of our extensions.. older versions won't work with Dreamweaver CC versions