Greetings!
As you've discovered, a full ClearScript build requires Visual Studio 2012 or 2013. A "NoV8" or custom build may be possible with an earlier Visual Studio version, but we don't test with those and cannot guarantee future compatibility.
By the way, Visual Studio Express 2013 for Windows Desktop is available at no cost.
Cheers!
As you've discovered, a full ClearScript build requires Visual Studio 2012 or 2013. A "NoV8" or custom build may be possible with an earlier Visual Studio version, but we don't test with those and cannot guarantee future compatibility.
By the way, Visual Studio Express 2013 for Windows Desktop is available at no cost.
Cheers!