I simply went up to GitHub and searched for your examples, found them, downloaded them.
Anyway, I'm using Visual Studio 2012 Ultimate. Windows 8.1 with .NET Framework 4.5.1 installed with Windows 8.1
Error 96 The type or namespace name 'Printing' does not exist in the namespace 'Aspose.Email' (are you missing an assembly reference?) C:\Developer\Aspose_Email_NET-master\KnowledgeBase\PrintingFeatures\CSharp\Program.cs 50 26 PrintingFeatures
So, looking at the program files (x86) directory, I don't see any printing assembly or what-not.
I'm wondering if I'm missing something.