I have tried to install same, but no success. Getting below error.
Could not get information from repository: http://addins.monodevelop.com/Alpha/Mac/6.1.5/main.mrep.
Xamarin studio Version (On Mac ) Version: 6.1.5 (Build 0)
Try manually downloading the .mpack file and add it. You can grab the file from here: http://addins.monodevelop.com/Project/Index/226
Once you have the .mpack downloaded, follow these steps to install it from Xamarin Studio.