Could you take a screen shot of the error message so I can see where you are getting the error?
Are you downloading the install file directly to your hard drive and then installing or running it directly off the web and into the temp files?
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.