Stage 2: vCenter Server
Click Next
Some pre-upgrade checks will take place.
You should see an warning about Update Manager 6.7. Please note, if you need to do any host upgrades up to version 6.0, you will need to do them manually as you can only do from version 6.5 onwards. 
I want to bring all my data across, but this option is completely up to you.
Review the options, place a check in the check box. The backup was done at time of snapshot. Click Finish to complete the migration.
Accept the warning. Click OK
Time for another coffee. Again, will be about 10-20 minutes for this process to complete.
Take note of the TLS message. Click Close to continue.
The deployment is will be complete after this.
When you click Close, vCenter will automatically open. Repeat this for any other vCenter servers.
Once you are happy with your deployment, you can delete the old vCenter VMs, remove the -new from the VM names and do a Storage vMotion, This will align the folder names and the corresponding files too.