The latest extension manager CC should work. Make sure you have it installed and that Dreamweaver CC 2015 is listed on the left side as an installed product.
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.