I have not used SketchUp for years and don’t understand my options today. I think version 2017 may be my last. Must I use the web version these days or can I still have a sketchup app on my Mac? I used it for woodworking drawings in the past.
Of the free desktop versions, SketchUp Make 2017 is still the latest one. It may not work so well on macOS Big Sur, but if you have an older system it should work ok. If you want to make sure you have the latest 2017 version, you can download it from here: