http://nuget.org/packages/Microsoft.CompilerServices.AsyncTargetingPack/1.0.0
https://www.microsoft.com/en-us/download/details.aspx?id=29576
https://blogs.msdn.com/b/lucian/archive/2012/04/24/async-targeting-pack.aspx
Now, this is some reasons for upgrading to VS11 even though you can't target .NET 4.5.
You still need to use TaskEx stuff though, so its not source-code compatible with .NET 4.5.
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