Sketchup Make 2017 keeps trying to open http://updates.sketchup.com/SWUpdate/scc

Starting a couple weeks ago, every time I start Sketchup Make 2017, it opens a web browser and tries to take me to http://updates.sketchup.com/SWUpdate/scc. The problem is that this web page doesn’t work.

I know Make 2017 is no longer supported, but obviously something has changed because it’s never done this before. How do I fix this?