ESET Endpoint Security version 9.1.2063.0 , you can perform a silent installation using a command-line interface, which is standard for business deployments. This specific version is a hotfix released to resolve issues like reboot notifications and email protection stability. ESET Tech Center Silent Installation Commands
The legitimate "free" aspects include:
To perform a silent installation of ESET Endpoint Security version 9.1.2063.0, you can use the command-line switches provided by ESET for its MSI or EXE installers. Silent Installation Commands en eset endpoint security 9120630 en silent free
Licensing and “free”/trial considerations ESET Endpoint Security version 9
msiexec /i ees_nt64.msi /qn ACTIVATION_DATA=key:AAAA-BBBB-CCCC-DDDD-EEEE PRODUCT_LANG=1033 PRODUCT_LANG_CODE=en-us /l*xv msi.log Use code with caution. Improved security posture : ESET Endpoint Security provides
Improved stability for the email client protection plugin in MS Outlook.
ESET does not offer a "free version" for business products, but you can use their official trials to test the software: