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Created attachment 6298 [details]
Installer DLLs diff
Just as for Xamarin.Android in bug #18024, it turns out the Xamarin.iOS installer for Windows is also currently missing the new assemblies from Martin's fixes for the Reactive Extensions NuGet PCLs (fixes bug #16720). In this case, the two missing assemblies are:
- System.Dynamic.Runtime.dll 
- System.Runtime.InteropServices.WindowsRuntime.dll 
As I understand it, what we would need for a fix in the current version (before the merged installer) would be to backport the changes to Xamarin.iOS 7.0.5, and then update the Xamarin.iOS Windows installer based on the new Xamarin.iOS build.
Just to be thorough, I've attached a diff of the DLLs between the Xamarin.iOS 22.214.171.124 installer and the Xamarin.iOS for VS 1.10.51 installer.
 There are at least three relevant commits in mono/master: