I read from Microsoft that Windows 8.1 apps will work correctly when installed on Windows 10. They obviously would not do any of the fancy things that a real Windows 10 app could do, but no surprise there. Quote "Apps built for Windows 8.1 run fine on Windows 10 devices" from https://channel9.msdn.com/Series/Developers-Guide-to-Windows-10-Preview/03.
I have created a Xamarin.Forms app for iOS, Android, Windows 8.1, and Windows Phone 8.1 (with the Windows platforms using Xamarin's WinRT). The app works fine on all of those platforms (at least aside from other bugs in Xamarin Forms that I've tip toed around...). But, I recently installed the Windows 8.1 app onto a PC with Windows 10 and it does not work. Once the app's launch image disappears, the app is just a black screen. I waited a few minutes, and nothing appeared.
Does anyone have any experience with running a Xamarin.Forms Windows 8.1 (WinRT) app on a PC with Windows 10? Have you had any success? I don't understand why it wouldn't work, but any thoughts would be great.