We have been trying to get the GWise 8 client rolled out, however have
come across MANY errors. Everything from DLLs not registering correctly,
to the familiar "Procedure Entry Point" issues. In the end, we've had to
resort to this manual process:

Control Panel -> Add/Remove Programs -> Remove GWise 7 and/or 8
Then delete C:\Novell\GroupWise
Then delete all GW*.dll (using search)
Install GWise 8

....not sure if this is the best way, and this is really going to be a
pain when we try and package this up via ZEN. Can anybody post back
their successful process of upgrading their environment? We have 4,500
workstations to get through, and these first 20 have been almost