Sketchup versions from 2013 onwards only allowed you to install the much larger full pro evaluation version, which after 8 hours of usage disables the "pro only" features, but leaving you with much more stuff on your hard drive.
And at some point the free version became a version that only runs in your browser. I only briefly tried the web version and didn't like it, though it's a good if you only want to view an existing cad model.
Up until 2020, you could still download the old version 8 off the SketchUp website, but I think they removed that to force you to use a newer, less straightforward version and annoy you into paying for something better. But as of 2021, I still use the old version 8 myself.
You can download the SketchUp model that I finished in the above video.
You can download the model that I created in this tutorial.
You can download the sketchup file that I started with in this tutorial.
More videos with SketchUp:
Bandsaw sawmill CAD model flythryough
Also see Jay Bates
Woodworking sketchup 8 tutorials
for lots and lots videos showing specific techniques.
And here's another collection of SketchUp tutorials on YouTube
Make large 1:1 printouts using my My BigPrint
program