I cannot register typemock in my Nant script

I am using the free version (but I guess there really isn't a free version), 3.6.1.0. My nant script looks like the following.

<target name="test" description="runs the unit and acceptance tests">

<!-- Dynamically load TypeMock task. -->
<loadtasks assembly="${typemock.dir}TypeMock.NAntBuild.dll" />
<typemockregister company ="MyCompanyName" license="MY-DEMO-LICENSE-HERE" />

<exec program="${typemock.bat.on}"/>
<exec program="${nunit-console.exe}">
<arg value="${project.tests.core.dir}in${binary.directory}Core.Tests.dll" />
</exec>
<exec program="${typemock.bat.off}"/>

</target>

My execution errors when running nant and executing the tests are the following.

test:

[loadtasks] Scanning assembly "TypeMock.NAntBuild" for extensions.
[typemockregister] Error Registering TypeMock.NET

BUILD FAILED - 1 non-fatal error(s), 0 warning(s)

C:Projectscommon.include(11,4):
Error Registering TypeMock.NET.

How do I register TypeMock.NET so I can use this framework? Is it even usable, or do I need to pony up the cash and buy it?

I just want to be able to build, test, and deploy my projects using TypeMock.NET. I am able to use RhinoMocks just fine without problems. There are some features of TypeMock.NET that I need, but I do not need all the features.

Can I realistically use the "free" version of TypeMock.NET, or is it going to be so miserable until I finally purchase the Professional, and then have to upgrade again to Enterprise?

Thanks for the help.