Assume that you perform one of the following deployments:
A task sequence by using the Download content if needed option
A task sequence to a System Center Configuration Manager 2012 Service Pack 1 (SP1) client or a destination computer
In this situation, the task sequence cannot download content from a Microsoft System Center Configuration Manager 2007 shared distribution point.
A hotfix that resolves this problem is available in the following Microsoft Knowledge Base article:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.