Installation of SEP 12.1 to a client witout removing installed AV (mcafee)

Hi,

   I need your suggestion. I installed SEP to the client via push installation. The client has a Mcafee 8.7i. The installation packages was successfully sent but theres no installation progress appear on the client.

   I also tried manual installation, and it was successful. SEP removed Mcafee Virus Scan but the Mcafee Agent remain.

   Any suggestion will help. Thanks.