If SketchUp 2020 is still running on an old computer, you can view the active serial number: Click Help > License in the top menu bar. Mac: Click SketchUp > License in the top menu bar.
Classic licenses are designed for single-user activation on up to two computers. If you have a new computer, you must first remove the license from the old machine before it can be added to the new one.
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Open SketchUp. You will see a "Welcome to SketchUp" window.
