You can use a deployment task in Trellix ePO - On-prem 5.10.x or 5.9.x to install Trellix ENS 26.x on your endpoints.
Deployment tasks can be set up as continuous (for endpoints in specific groups or with specific tags) or fixed (for a static set of endpoints).
Before the installation:
Verify that all endpoints meet the minimum requirements (KB82761).
Verify that required patches are applied to the endpoints (KB96488).
Verify that you're aware of compatibility requirements for other installed products.
On endpoints running Microsoft Windows 10 October 2018 Update or later, verify that the case-sensitivity attribute is disabled for folders in your source and target installation paths and \Windows\System32\drivers.
Verify that endpoint users have permission to access the user temp folder (KB85033).
Verify that the newer Root Certificates have been applied to the endpoints (KB91697).
Note
The installer now automatically detects missing Root or Intermediate certificates on the endpoint before proceeding. This check prevents installation failures caused by incomplete certificate chains.
Install product extensions and installation packages on Trellix ePO - On-prem.
After the installation:
Disable the Windows firewall to avoid conflicts with McAfee Host IPS rules.
Configure your policy settings for your environment, as needed.