We use a VMware VCenter installation with a Essentials Plus license.
The official VIC Documentation says the following
Get vSphere Integrated Containers
To obtain the latest official release of vSphere Integrated Containers, go to the vSphere Integrated Containers download page on vmware.com. This page includes the downloads for both vSphere Integrated Containers Engine and vSphere Integrated Containers Registry. You need a vSphere Enterprise Plus License to download an official, supported release of vSphere Integrated Containers.You can also obtain open-source releases of vSphere Integrated Containers that are more recent than the latest official release:
How to understand that?
a) If you do have a vSphere Enterprise Plus License you may download open-sources releases, too
b) If you don't have a vSphere Enterprise Plus License you can download open-source releases instead
No, you need distributed switches to run VIC so hence you need a licence that supports that feature.