I am trying to install newest ENS version on that clients (ENS December Update and McAgee Agent 5.6.0). If it still cannot install, I will create case to request support from technical team of McAfee. I will give you solution latter.
@tassha There are many reasons why the installation of any point product can fail. It's worth gathering the logs and submitting them to support as each case will likely be different. There are currently no major known issues with installations - the only thing to be aware of is the December Update. If you already have 10.6.1 + any HF installed, you'll need to wait for the Febuary Hotfix to update the clients to.