When you pull down the samples I’ve linked, the packages folder is not included (mostly because it is huge).

To restore, the packages folder in Visual Studio 2010, right-click on the Solution and Enable the Package Restore option. This is really useful for both these downloads, and if you are building your solutions on a CI server so that you don’t need to check the packages folder into Git (saving space on your source code repository as well).

Package Restore Option