I would like to use the Union (Spatial) * method with multiple input features, but this doesn't seem to be allowed within Runtime as you can't get an Advanced license for the Runtime environment? Is that correct?
*: Union (Spatial) method: ArcGIS Help (10.2, 10.2.1, and 10.2.2)
License: With ArcGIS for Desktop Basic and Standard licenses, the number of input feature classes or layers is limited to two.
Edit/update: error message while executing GPK:
Failed to execute. Parameters are not valid.
ERROR 000384: Cannot have more than 2 inputs with the ArcView or ArcEditor license
Failed to execute (Union).