3D warehouse won't open

[DaveR]

If you are still using SketchUp 2015 as indicated in your profile, you won’t be able to open components or models from the 3D Warehouse. The Warehouse only supports the most recent three versions so now that would be 2017, 2018, and 2019. You could download the Collada file and import the .dae file into SketchUp but the best solution at this point would be to upgrade to the current version of SketchUp.

See:

3D Warehouse Downloads for 2016 models

No, we generally only support 3 version of SketchUp. 2016 also uses older versions of native browsers, and unfortunately in the world we live in, it’s no longer acceptable or secure to run older sw that hasn’t been updated in sw we don’t control.