If you download code from Source control after opening solution you will be prompted to remove Source control bindings. Choose Yes, 'cause you don't have an account in codeplex or at least you are not member of worm team. If you download source code from release package, this step will not appear.

After that you will be asked about VSTool project what needs VS SDK to be installed. Press ok to unload the project.

Ok, now the solution is loaded and could be built. But additional actions could be required to run test.

First of all, almost all test requires SQL database, so you have to have SQL Express or higher edition of SQL Server. By default connection string starts with "Server=.\sqlexpress". You should replace this part according your server location. All changes should be made in UnitTesting project.

Next, you should define or undefine UseUserInstance custom constant in Advanced compiler setting window at compile tab.

Now, all tests should work fine.