Unity 5.3.1 and newer are supported. Pro license is not required.

Indie version has full functionality but does not include the plugin source code, which is available in the Pro version. Pro version includes full plugin Java and C# source code.

Check out the details from the Unity Asset Store: https://assetstore.unity.com/packages/tools/integration/ulivewallpaper-pro-52477#description

Now download uLiveWallpaper (Pro) Free Unity