Your version of BE is no longer supported so the SDR image is no longer available for download.
If you need to recover a VM image, just do a normal restore. You don't need the SDR image for this.
Do you have any idea how that VM was backed up?
I mean with that; was that VM backed up via the Virtual Agent -> backed up the VMDK's?
or like a Physical Server?
Are you trying to restore the VMDK's or are you selecting files or what do you select for restore?
Can you share a screenshot