eset_endpoint_security_9.1.2063.0.exe /S /v/qn
eset_endpoint_security_9.1.2063.0.exe /S /v/qn /D="C:\Program Files\ESET\ESET Endpoint Security" /LICENSE=accept EN ESET Endpoint Security 9.1.2063.0 EN Silent ...
Here's an example command that includes additional parameters: eset_endpoint_security_9