We've had several customers raise the issue of our setup blocking if "VS 2008 Team System - Test Edition" is not installed. Many were using the Developer Edition or even VS Pro.
After reviewing all the VS 2008 APIs that Pro and the rest of the VS Team System editions expose, we confirmed that eveything we need for the designer is supported unlike VS 2005. With that in mind, we simply removed all the setup restrictions and the designer now works in full functionality on VS Professional and any of the VS Team System SKUs. The only feature that requires the Test Edition is the "WebAii Test to VS WebTest" conversion since only VS Test Edition has the WebTest type.
If you are an existing customer that already registered and downloaded the designer and wish to get the setup without the Test Edition block, simply re-download the designer setup from the link you got from us. It should be updated with a new setup.
Enjoy!
Please let us know if you have any questions or concerns.
ArtOfTest, Inc.