Error while installing MonoGame for Xamarin 5.0.1

I tried to install MonoDevelop pack to Xamarin 5.0.1 for Windows (from here), but when I try install it there is error

screen

I run MonoGameInstaller-3.2.exe but there is still problem
I don’t know, what I do wrong, if there is topic about same problem, please, give me link, and delete this topic (and sorry for that)