Once you Deploy the client, supposing that you did install the NetClient portion, you could enter the address of your EA server into the avast5.ini file. Essentially you did this when you copied the settings from another client.
Far easier would be to make a offline deployment package from the EA Console, then use this to install the clients if you must do so manually. The proper ini file will be included in the install package. In EA, create a Deployment Task and Under the install options choose the option "Just generate setup package" and enter the path where you want the install package to be located.
EA is good about automatically creating any clients deployed offline in the catalog at their first check-in (SOA not so much
)