There isn't an install menu for WebAssist. The extensions are installed with the Extension Manager and the WebAssist installer launches automatically the next time a page is opened in Dreamweaver.
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.