Installing xamarin in visual studio 2015 manually in windows 10

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C#

Gtk#

Xamarin

I have being trying to install XamarinStudio in my visual studio 2015 and it ask that I first install Gtk# 2.12.22 or higher. I have downloaded different versions of Gtk# to install but I keep getting the error message WinProject1.cab is corrupt for all the version I downloaded.
please help me out.

I am learning how to create mobile applications. Can anyone help me with other software's which can be used to create mobile applications across multiple
platforms. Thank you

What I have tried:

I try downloading different version of Gtk# (2.12.25, 2.12.26, 2.12.38, 2.99.3)to install but still get the same error message