That's par for the course especially with a two year old OS to not have
the latest and greatest MDM capabilities. I think you answered your own
question here as well. Apple's biggest desire is to have its user base
on the latest OS release if the har...
If you all are trying to stage the installer on a client then perhaps
the erase-install script from Graham Pugh could be an alternative versus
pulling it down from your dist. point? I've never had good luck putting
large multi gigabyte files on mine ...