How do I set the install path?

We need the 6.5 agent to coexist with the adaptive agent for a couple of months, so I need to install the new agent to a different path, right? We have disabled file and print sharing on the xp workstations, so I have to use zen 6.5 to deploy the standalone agent. I'm following the docs for the manual install and for setting the zenworks_home variable to a different path (c:\zcm10\Novell\ZENworks). The problem is that I don't see a switch to tell the installer what path to use, I only see where to extract the files. Thanks.