hpguru ...although this forum section says 'Stardock Support' it is infact a forum where fellow users can assist with issues pertaining to Stardock software...from time to time there will be some.
Stardock's Support staff will often be online here to assist...but the Official Support is support@stardock.com where your problem can be resolved [appropriately during business hours, US-time].
The most likely cause for a failed download with Stardock software is the same as any other software download...an interrupted Internet connection, or 'unwanted' intervention from an installed AV program or firewall.
Temporary halting of such will often resolve things, though once you have a failed download you will need a cache clean [reboot] so as not to inadvertently 'redownload' the same corrupted file from cache....