Source for Sketchup Pro 2016 download

I need to transfer my Sketchup Pro 2016 license to a new computer. However, it seems that I must download a 2016 copy before my license and authorization copy will work. Where is such a copy for download?

Try here. This has been the final link although I don’t know if it still works. Keep in mind that many features in SU2016 are no longer supported including the 3D Warehouse and Geo-location.