After using "VMware-VirtualSAN-Witness-6.0.0.update01-3029758.ova" as my vSAN witness I look at Health and see this under "Cluster > ESX Virtual SAN Health service installation":
Host updated to 6.0 U2. Health checks disabled
The problem is that from this version the other vSAN Witness appliances jump to version 6.5 ("VMware-vSAN-Witness-6.5.0.update01-5969303.ova" , "VMware-vSAN-Witness-201704001-5310538.ova") neither if which I can get to join vCenter (6.0 (U2?) build 3617395).
Is there a version 6.0 U2 version of the witness OVA that is hidden somewhere?
Use this one for 6.0 U2 (vSAN 6.2):
Release Date: 2016-03-15