In a previous post I mentioned that uninstalling Visual Studio 2017 RC broke any existing Xamarin projects, removed the templates, etc. and that I hadn’t figured out how to fix it.
Here’s how you fix it:
Go the Xamarin web site and go to the download page. Annoyingly enter in your contact information for the 17th time, and then where it asks you if you already have Visual Studio installed, select ‘no’. Download the file, execute it, and it will reset things (it doesn’t actually appear to download anything that I could tell, but it’s hard to tell).
When you then load a Xamarin project, it will tell you an update is available, etc. You should be good to go.