you can install all of the extensions in the extension manger, then open DW to have the web assist installer run, it will run for each extension.
then restart DW.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.