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All ESXi 6.7 installations contain vSAN - this is not a separate downloadable install as the vSAN modules are embedded in the ESXi kernel.
Thus, use the latest 6.7 version available.
Thank you for the clarification.
Happy to help.
If you have more questions once you get your cluster going, please do ask here.
Or if it is something more in-depth/time-sensitive/critical please do contact vSAN team at VMware GSS.