details of the deprecated server behaviors extension can be found here:
you can install the extensions on multiple versions of the dreamweaver on the same computer and only use one license, the activation is based on the computer, not the version of dreamweaver.
Design Extender has a tool for adding Power CMS Builder which can be used for a blog, there is a tutorial for that on the you tube channel. Dynamic content can be done with Data Assist. see the data assist section of the Data Bridge getting started guide.