What Novell client am I supposed to have on my workstations to get ZW6.5 clients to install correctly?

I keep installing the Zfdagent.msi (SP2) on workstations and then having them hang forever after the login. What should I be doing different? It seems to work okay on some stations, but not most. This is my first attempt to use Zenworks.

The Novell client I'm using is 4.91sp1.

TIA for any insight