I liked this exact version of Sketchup back in my day and I want to get it again. So my request is quite straightforward. Can someone, please, share a decent marketplace where I can buy it?
That's a reasonable request. What is unreasonable is Autodesk's pricing policy. I mean, what are they thinking right? Fortunately, it is possible to get the sketchup pro 2020 for neat price. You will need second-hand software marketplace. You can find out more about sketchup pro at procadis.com