How to perform "side-by-side" migration from vCenter 5.5 to 6.0 U1?

Hi,

I got question regarding "side-by-side" upgrade and/or migration from Windows Server 2008 R2 VM with vCenter Server 5.5 with SQL Express and Update Manager to new fresh Windows Server 2012 R2 VM that will act as vCenter Server 6.0.

How do I perform this upgrade?

Please keep in mind that I'm working with vDS all over the hosts, so "workarounds" like that are problem to me:https://www.reddit.com/r/vmware/comments/3ro29j/side_by_side_upgrade_of_vcenter_of_55_to_6/

Thanks!