"I didn't know the Webassist extensions has a limited time to use."
there is no time limit, you can continue to use the older version of Dreamweaver and use the older version of Universal Email.
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.