Before you waste your time, don't try this with DW CC 2015...it complains that this extension only runs with certain versions of DW...

Hello,
Not only the extension works with CC2015, but it is the version we recommend to use. If you have troubles installing the extensions, this is most probably caused because you are trying to install it using Adobe Extension Manager and as you've most probably heard Adobe discontinued support for their Extension Manager and it does not support the latest DW versions, so extensions cannot be installed using it.
You should use the DMXzone Extension Manager in order to install extensions: www.dmxzone.com/go/22670/dmxzone-extension-manager-for-dreamweaver

I'm using your Extension Manager...it just doesn't want to work, mate! I spent two hours piddling around, downloading, uninstalling, reinstalling. BTW, the error was from your extension manager.

So could you please be a little more detailed? what error do you see and when exactly do you see it?