I update Xamarin 2 days ago, and in fact it updated all the framework in order to make possible the replacement by visual studio....
Once done, Xamarin studio relaunched and:
- he announce that monogame is not compatible anymore with the new versions
- he propose to download visual studio in order to replace Xamarin.
Now Xamarin is death. Not possible anymore to download it, you are redirected o visual studio for Mac.
So, it's time to make monograme compatible with the new environnement (visual studio).