I get this error when trying to use it.
 
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
 
************** Exception Text **************
System.IO.FileLoadException: Could not load file or assembly 'file:///C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Packages\Debugger\Visualizers\MvcRouteVisualizer.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)
File name: 'file:///C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\Packages\Debugger\Visualizers\MvcRouteVisualizer.dll' ---> System.NotSupportedException: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information.
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks)
at System.Reflection.RuntimeAssembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, Boolean suppressSecurityChecks, StackCrawlMark& stackMark)
at System.Reflection.Assembly.LoadFrom(String assemblyFile)
at Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.ClassAndAssemblySpec.CreateAssembly(Dictionary2 dictionary, AbstractAssemblyResolver resolver)
at Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.ClassAndAssemblySpec.CreateInstanceOrType(Dictionary2 dictionary, AbstractAssemblyResolver resolver, InstanceOrType instOrType)
at Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.ClassAndAssemblySpec.CreateInstance(AssemblyResolver resolver)
at Microsoft.VisualStudio.DebuggerVisualizers.DebugViewerShim.ManagedShim.DelegatedHost.CreateViewer(IntPtr hwnd, HostServicesHelper hsh, SafeProxyWrapper proxy)
 
 
 
 
************** Loaded Assemblies **************
mscorlib

Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.225 (RTMGDR.030319-2200)

CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll

Microsoft.VisualStudio.Platform.AppDomainManager

Assembly Version: 10.0.0.0
Win32 Version: 10.0.30319.1

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Platform.AppDomainManager/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Platform.AppDomainManager.dll

System

Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.225 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll

System.Configuration

Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

System.Xml

Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.225 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll

System.Windows.Forms

Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

System.Drawing

Assembly Version: 4.0.0.0
Win32 Version: 4.0.30319.1 built by: RTMRel

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

Microsoft.VisualStudio.DebuggerVisualizers

Assembly Version: 10.0.0.0
Win32 Version: 10.0.30319.1

CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Microsoft.VisualStudio.DebuggerVisualizers/10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.DebuggerVisualizers.dll

 
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
 
For example:
 
<configuration>

<system.windows.forms jitDebugging="true" />

</configuration>
 
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.