I'm still on CS3. Version 1.1.3 of Digital File Pro. I am on Windows 7 64bit.
I noticed that there was no WebAssist folder at C:\Program Files(x86)\Adobe\Adobe Dreamweaver CS3\configuration\Shared\ at all so I tried copying the WebAssist folder to there from the AppData location. There were still errors however, but they were different from the original. There is no WA_UserInterface.js file in DFP's Library folder. I tried copying that file from a different plugins Library folder, but still get errors for other files.
Thanks for your time!