I downloaded OVA VMware-Skyline-HealthDiagnostics-Appliance-3.0.0-18970502_OVF10 on 6.7 for my 13 node cluster. Using this link SHD and ESXi 6.0 - VMware Technology Network VMTN This is the error message I get. See error attached picture.
Looks like some connectivity issue on the infra, could you please retry and update?