Not a Compatibility Issue
This better not be a compatibility issue because it was sold to me by your company with no regard to what version of Dreamweaver I was using. Your own website shows that CS5 meets the requirement for both products, and that is exactly what I am using.
As for install order, I realize this could be the case but I have already installed both products starting with Digital File Pro then ending with Security Assist as has been suggested (I had previously tried the install in the opposite order as well).
It would be fine if CSS Form Builder would work, and I was told by Sales/Customer Support that she would call me back today so that we might try that option. But she also insisted that the two products I have are in fact compatible.
At this point I have tried to contact WebAssist after not hearing back from anyone in what I feel is an excessive period of time. Something is very seriously wrong with this picture.