thank you, I've done what you posted several times before I contacted the forum. And I've also followed what you said
But the result is still: The extension package is invalid. The extension will not be installed.
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.