Regardless of having the latest version installed, the CMS must have been created before you installed that version.
any new CMS Systems that you create should have that code in the configuration.js file already.
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.