you can install the extensions in multiple versions of dreamweaver on the same computer, or even for different users in multiple dreamweaver versions.
the activation is based on the computer, not the dreamweaver version or user that is logged in.
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.