Created a new Notification Server and then a few packages on this newly built server do not download. Error while downloading package:
The version of the package on the server (1447324708) is older than required (1461058661) (0x80004005)
SMP 7.x, 8.x
The snapshot for the packages in question were out of date on the Notification Server.
Deleting the old snapshots and then having the "NS.PackageRefresh" process rebuild the deleted files resolved the issue. To do so please see the following steps: