The tests created by WebUI Test Studio (either Dev or QA edition) indeed require the Run-Time Edition as a minimum to execute those. These tests are far more complex than just the code the framework operates with.
WebAii is just a library one can use to code UI tests (running in the browser) using any of the .Net programming languages (C#, VB). With the framework you write the tests and execute them via any of the supported runners (VSUnit, NUnit, MbUnit, xUnit).
I hope that clears the confusion. Please let us know should you have additional questions.
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