After lots of struggling, I managed to port the VimeoDotNet code to Windows Runtime and Metro platform. Developing Metro style applications is very frustrating for a long time .net developer and needs a lot of time to get used to it. Most of the familiar classes in .net that we were used to, are replaced with Windows Runtime classes in the Windows namespace. The old .net namespaces are still there, but are filled with nonsense.
Anyway, the new library is available online and has all of the features of VimeoDotNet. You can read about it here.