In the UI for Xamarin installation folder you'll find sub-folders for each platform, we keep the required assemblies for each platform in one place so that you can select them all at once. Let me take you through the major points.
Android Assembly References
Since you don't have a PCL, you only need to use the assemblies in the Android folder: C:\Program Files (x86)\Progress\Telerik UI for Xamarin R3 2017\Binaries\Android
Here's a screenshot of the assemblies to add to your Android project's references:
You no longer need to add any renderer declarations, that was a requirement for older versions of UI for Xamarin (2017.1 and older). All you need are the references.
- Android Support Libraries
Go here to see the Xamarin.Android.Support dependencies
you'll need to add NuGet packages for (if you're not already using them). You stated that you're target 23, make sure your support libraries are targeting at least 23.3.0
Several of the controls (Gauge, BusyIndicator, Rating) use SkiaSharp for rendering, you will need to add a the SkiaSharp.Views.Forms 1.59.2 NuGet package.
Note: If you don't end up using those controls, you can instead reference the Lite assembly to bypass the NuGet package
I hope I was able to clear things up. If you have any further trouble, open a support ticket here
with the specific details of your project and we'll dig deeper.
Lance | Tech Support Engineer, Sr.
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