The 3D Warehouse supports only the latest three versions so 2019, 2018, and 2017. You could access the Warehouse through your browser and download the Collada file and import it into SketchUp 2015.
The 3D Warehouse supports only the latest three versions so 2019, 2018, and 2017. You could access the Warehouse through your browser and download the Collada file and import it into SketchUp 2015.