I just tried to upgrade to Server version 7 with the steps provided here (creating a client task with pointing to the Server_x64.msi), but installation fails because of the following error (found in the Event Log) "Product: ESET Management Agent -- Error 1921. Service 'ESET Remote Administrator Agent' (EraAgentSvc) could not be stopped. Verify that you have sufficient privileges to stop system services."
I also can't stop the Agent manually as it's running as a system service. Have tried to reinstall the Agent, but that didn't help.
Server: Windows Server 2012 Essentials (64-bit)
ESET Remote Administration Server 6.5.522.0
ESET Remote Administration Agent 6.5.522.0