Client is using older version of vCenter 6.5 can I run vSphere with Tanzu on it ? As vSphere with Tanzu requires to run on at least vCenter 7.0 version.
Haven't you answered your own question?
You thread needs moving to the vSphere area, since you are not using the vCenter Orchestrator Plug-in SDK - I've reported it, please don't create a duplicate but wait for a moderator to move it.
Yes . vSphere with Tanzu feature support came on vCenter/ESXi 7.0/NSX-T 3.x version onwards.