Please see https://releases.xamarin.com/stable-release-15-3-2/ for the details about this release, including the steps to update or downgrade as needed.
Please also see https://releases.xamarin.com/stable-release-15-3-2/ for a summary of fixes included in this release and remaining common issues from the Xamarin 15.3 release.
This release is now available as part of Visual Studio 2017 version 15.3 and in the Stable updater channels for Visual Studio 2017 for Mac and Xamarin Tools for Visual Studio 2015.
Please file a quick bug report using the "15.3 Release" new bug form if you see any suspicious behavior in these versions that you wish to report.
Comment in this forum thread if your question is not related to a suspicious behavior after download, but instead one of the following: