iOS9: Try to open app via scheme if possible, or redirect to app store otherwise

The iframe trick no longer works — my guess is that Apple knows it will encourage more developers to implement Universal Links, more quickly.

You can still set window.location='your-uri-scheme://'; and fallback to the App Store after 500ms. There is a “dance” between popups if you take this approach, as we do at Branch (we do as a fallback if Universal Links don’t work).

window.location = 'your-uri-scheme://'; // will result in error message if app not installed
setTimeout(function() {
   // Link to the App Store should go here -- only fires if deep link fails                
   window.location = "https://itunes.apple.com/us/app/myapp/id123456789?ls=1&mt=8";
}, 500);

I wish I had a better answer for you. iOS 9 is definitely more limited.

For a helpful overview of what’s needed for Universal Links should you go that route, check out my answer here or read this tutorial