I am experiencing a similar issue to post 9664 "Installation failed - sufficient privileges to stop system services" (9/29/2016), which never listed a resolution.
Using All-in-one installer (agent + ees) to perform a fresh install of Eset (not an upgrade) on a clean install of Windows 10 Pro, Creators Update. It successfully installs the Agent, but fails to install Endpoint Security. I have tried using network administrator credentials, domain administrator credentials, and local administrator credentials. I have tried installing over the network and locally. I have tried installin