Having the .ova file within the vCenter datastore enables the VM to be created faster.
The download file names are appended with 14 numbers representing when the template was created by Teradata: the year (4 digits), month (2 digits), day (2 digits), hours (2 digits), minutes (2 digits), and seconds (2 digits).
Following is an example of creating a Viewpoint virtual machine from a Linux VM cloned from Analytics Database OVA using an absolute path:
{
"ESXiHost": "cs3097-05.labs.teradata.com",
"Datastore": "cs3097-05.datastore",
"vmName": "cobra35",
"eth0": "10.25.28.119",
"vmType": "vp",
"Template": "/var/opt/teradata/ovaImages/VantageCore_VMware_Viewpoint_XX.XX.xx.xx_SLES12_SP3_xxxxxxxxxxxxxx.ova"
}