Hello Amer,
The first detail that needs to be check its if you current hardware support UCCX 7, this can be check in the UCCX compatibility matrix.
http://tools.cisco.com/squish/f7BAe
Also you will need a license upgrade from UCCX 4.0(5) to 7.0(1) that can be requested to Cisco licensing team.
After that you need to follow the procedure that its under the UCCX 7, intalation guide;
http://www.cisco.com/en/US/docs/voice_ip_comm/cust_contact/contact_center/crs/express_7_0/installation/guide/uccx70ig.pdf
HTH
Please rate this post if was helpful
Walter Solano
CCVP, Cisco UCCX Specialist
Cisco IP Communications Express Specialist