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The .nupkg for Xamarin.FaceBook.iOS 4.11.0 seems to be invalid. If I download the .nupkg and look at it with 7zip it has a 'lib%5CXamarin.iOS10' directory where the backslash has been encoded into the directory name.
When this is installed it does not create the Xamarin.iOS10 directory inside the lib directory. Instead it creates a single lib\Xamarin.iOS10 directory with the backslash in the directory name.
I have a similar issue with Xamarin.Facebook.Android 4.11.0. It just won't install on Xamarin Studio.
I see this output when updating and reproducing this issue:
Looking for updates for 'Xamarin.Facebook.iOS'...
Updating 'Xamarin.Facebook.iOS' from version '184.108.40.206' to '4.11.0' in project 'ioSanity'.
Removing 'Xamarin.Facebook.iOS 220.127.116.11' from ioSanity.
Removed reference 'Facebook' from project 'ioSanity'.
Added file 'packages.config'.
Added file 'packages.config' to project 'ioSanity'.
Successfully removed 'Xamarin.Facebook.iOS 18.104.22.168' from ioSanity.
Uninstalling 'Xamarin.Facebook.iOS 22.214.171.124'.
Removed file 'Facebook.dll' to folder '/Users/kentgreen/Projects/ioSanity/packages/Xamarin.Facebook.iOS.126.96.36.199/lib/Xamarin.iOS10'.
Removed folder '/Users/kentgreen/Projects/ioSanity/packages/Xamarin.Facebook.iOS.188.8.131.52/lib/Xamarin.iOS10'.
Removed folder '/Users/kentgreen/Projects/ioSanity/packages/Xamarin.Facebook.iOS.184.108.40.206/lib'.
Removed file 'Xamarin.Facebook.iOS.220.127.116.11.nupkg' to folder '/Users/kentgreen/Projects/ioSanity/packages/Xamarin.Facebook.iOS.18.104.22.168'.
Removed folder '/Users/kentgreen/Projects/ioSanity/packages/Xamarin.Facebook.iOS.22.214.171.124'.
Successfully uninstalled 'Xamarin.Facebook.iOS 126.96.36.199'.
Xamarin.Facebook.iOS is up to date.
Marking as "Confirmed"
We have pushed updates and these packages should work fine.