BTW, the last free desktop version of SketchUp was "SketchUp Make 2017", which (for now) you can still get here:
https://help.sketchup.com/en/downloading-older-versions
It will have the "Pro" features for 30 days and then revert to the "free" feature set after that. Other than being able to natively export OBJ files (which you can just as easily do in the free version with a plugin that is referenced a bunch of times in this forum), I don't even remember what the differences in the Pro version were.