Adding RHCL to a build machine

Hello all-

I am creating help docs for my team using RoboHelp. I would like to make building the chm part of our nightly build process on our build server. Since this machine is only used for building our source tree, I only want to install rhcl, not the full RoboHelp suite. Is this possible? I tried just copying the rhcl.exe executable, but it asked fo a license when I ran it.

Thanks!