Well there you go then... Adobe's extensions don't work past php v6. You would have to install the webassist MySQLi extension or the DataBridge BETA to work with php7.
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.