If the free edition suits your needs we encourage you to use it instead of the trial version. In the trial, assemblies stop being usable 24 hours after their last recompilation.
In general, you should be able to make them work using Rebuild for the solution - so that both the DLL for the project containing your model and the one that will host the service will be created again. We are going to double check for problems in this behavior.
Do not hesitate to contact us if you experience any other issues.
the Telerik team
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