Update :Sunday, Sept 21 2014 07:15 PM UTC
We have put in an automated workaround to mitigate the customer impact. DevOps will continue to investigate to root cause this issue .
Initial Update: Sunday, Sept 21 2014 04:48 PM UTC
We are currently investigating issues with codeplex.com downloads where users may have issues downloading content from the site.
We apologize for the inconvenience and appreciate your patience.
-MSDN Service Delivery Team