Yes it should work. I use them with the latest versions.
It sounds like it may have not fully installed. Usually the steps are:
1) Install with DMXZone or Command line
2) open Dreamweaver and open a page and the webassist secondary installer will run
3) close and restart Dreamweaver
It sounds like the secondary installer never ran in your case. Try reinstalling following these steps. If the DMXZone extension manager doesn't work, try command line installation.