Name: Data domain ost
File size: 639mb
File format: EXE
You can download data domain ost on the site areasehat.com
However, its always good to know more. If you go back in time to what VTL was born from, it really was a jury-rig approach to doing backups to disk. Conrtact Dell-EMC Support, you should have a support agreement if you are playing with the OST plug in, not unless your are checking out their virtual appliance.