Having the .ova files reside on your desktop takes vCenter longer to import and create the VM. 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 your desktop using an absolute path:
{ "ESXiHost": "cs3097-05.labs.teradata.com", "Datastore": "cs3097-05.datastore", "vmName": "cobra35", "eth0": "10.25.28.119", "vmType": "vp", "Template": "C:\Templates\Vantage_on_VMware_Viewpoint_XX.XX.xx.xx_SLES12_SP3_xxxxxxxxxxxxxx.ova" }