I have 3 primary servers that have been upgraded to ZCM 11 SP3 and I would like to install the optional update "Windows 8.1 Update for ZENworks (11 SP3)." I have the update in the zone and replicated to all 3 servers, but when I try to deploy it I get the following?

"The wizard cannot continue for the following reason(s):
Unable to complete your request for the following reason: ZENworks could not detect if the ZENworks Server or the ZENworks Loader services are running on one or more Primary Servers. You need to stop the services before proceeding with the System Update. Check the logs for more details."

I've never seen an update like this? How do you make this happen?

I also do not know WHERE those log files are!