In your EEPC6 downloads, there's a full documentation package - in there's a "Migration Guide" which gives you all the steps to migrate EEPC5 machines to EEPC6.
If you dont' have the docs (I strongly suggest you download them!), you can find the guide by searching for "migration guide" on kc.mcafee.com - be sure to get the right one for your version of EEPC.
I have created a new Agent Deployment package called FramePkg.exe from EEPC6.2. when i run it from one of the laptops, i get an error:
"The account name is invalid or does not exist or the password is invalid for the account name specified"
I think you mean you created the package from EPO? If so you might want to open a thread in the EPO group - this group is really only expert in the EEPC product, not the McAfee agent.