Silent install for client deployment

Hi

I am trying to deploy GravityZone client (Endpoint Security Tools ver 7.2.1.73) to multiple machines. What are the correct command line parameters to install the client silently?

I have downloaded the full kit installation files and extracted the compressed files.

I have tried the following;

epskit_x64.exe /silent

epskit_x64.exe/silent

epskit_x64.exe /qn

Each time the qui installer pops-up and runs through the installation then waits for me to press finish.

TIA for any help