Moved to Business > ePO for faster support.
Hi Ranjith -
The information in the KB article is correct. If you are using a version of Drive Encryption older than DE / EEPC than what is listed in the KB article, you will not be able to upgrade to ePO 5.3.
EEPC 6.x has been EOL for quite some time now. See https://kc.mcafee.com/corporate/index?page=content&id=KB78003 for further details.
I would recommend working to upgrade your clients to a supported release of Drive Encryption.