Select “Universal 8.1” SDK under Windows Store platform.
No worries. Here’s all of them:
| UNITY_WP8 | defined on Windows Phone 8.0 apps only; |
| UNITY_WP_8_1 | defined on Windows Phone 8.1 apps; |
| UNITY_WSA | defined on Windows Phone 8.1, Windows Store 8.0, Windows Store 8.1 and Universal 8.1 apps; |
| UNITY_WSA_8_0 | defined on Windows Store 8.0 apps; |
| UNITY_WSA_8_1 | defined on Windows Store 8.1 apps; |
| UNITY_WINRT | defined on both Windows Phone and Windows Store apps, regardless of version; |
| UNITY_WINRT_8_0 | defined on Windows Phone 8.0 and Windows Store 8.0 apps; |
| UNITY_WINRT_8_1 | defined on Windows Phone 8.1, Windows Store 8.1 and Universal apps regardless of device it’s running on; |
| NETFX_CORE | defined on Windows Store 8.0, Windows Store 8.1, Windows Phone 8.1 and Universal 8.1 scripts that are compiled using Microsoft C# compiler. |
Please check PluginInspector.html
Note: We do not support Windows Phone 8.1 silverlight assemblies as plugins for Windows Phone 8.1.