You want to remove on upgrade to the newest version?
If you want to upgrade just create a client task with the latest DLP version and deploy over existed.
If you want to remove create a client task with DLP 9.3.0 Remove and another task for systems with DLP 11.0.400 version
You can use client assignment by TAG, before scheduling or running task you can TAG machines with DLP 9.3.0 etc TAG "DLP9" and create assignment Client task "Remove DLP 9.3" for machines with TAG "DLP9" and do same with version 11
also you can use McAfee removal tool, localy on machine or check in into ePO and run Removal tool from ePO.
Removal tool avalable from mcafee product download we page.