our policy is and always has been to support the current version of Dreamweaver and 3 version previous. right now, with DW CS 5 and CS 5.5 we have to make that the current version and 4 previous.
If we where to update the older extensions to support DW CC, we would need to also update them to include all the version between 8 and up, there is simply no way that we can do that much QA testing. it is not possible for us to offer a product that will work over that wide a platform.