So, I have sreached for a solution for about 3 hours but it looks like I'm the only person with this problem.
I want to edit the Main.axml, the layout for an app but I get the message "Something went wrong, Android SDK is too old.". So I updated Xamarin to the stable version and go on tools >android > android SDK Manager, and there is NO update to do (look at the picture). http://puu.sh/rzONp/a676cde55f.png
Can someone please help me?