If you search in the forum you will find the broad explanation for which you can no longer download directly into SketchUp, Internet Explorer is no longer developed now (see: Sketchup 2016 3D Warehouse suddenly stopped working 5 days ago - #5 by joypareja).
What I pointed to is how you can continue to download 3D models from 3D warehouse and open/import them into SketchUp 2016.
About the teacher, you said “as a student”, and I thought you have a teacher for SketchUp. It doesn’t matter anyway.