If you previously had 6.5sp1hotpatch 3 installed, you may run in to problems
when you try and upgrade to the SP2 agent.

for some daft reason hotpatch 3 had version numbers of 6.5.3.0 & 6.5.5.0 for
example,
zenapws.dll 6.5.3.0 & nalntsrv.exe 6.5.5.0 so the agent install will not
replace these files, so make sure you remove the old agent first. or I think
use REINSTALLMODE=vamus

We had to roll out hotpatch3 in a live environment because we had so many
machines affected by the hyperthreading bug and at the time there was no
release date for sp2.

This sounds a lot like the recent Netware 6.5sp4 mixup where all the version
numbers where recently messed up by not being updated in the service pack!!

Hope this helps,

Nathan Lock