When upgrading to Drive Encryption 7.1, do not leave the EEPC 7.0.4 extension checked in. You will only use the EEPC 7.0.4 extension after you have performed the User Data Upgrade. When that is complete you should immediately upgrade to DE 7.1.
Before upgrading to DE 7.1, for best results, please read KB79784 — FAQs for Drive Encryption 7.1 (https://kb.mcafee.com/corporate/index?page=content&id=KB79784). It provides useful tips and more information on EEPC 7.0.4 extension.
If you want to review the process for upgrading to DE 7.1, see the following Product Guide:
PD24867 - McAfee Drive Encryption 7.1.0 Product Guide (https://kb.mcafee.com/corporate/index?page=content&id=PD24867)