Search your inbox for "SketchUp License" or "Trimble" from the date of your purchase or last upgrade.
If you still have SketchUp 2020 installed on an old machine, go to Help > License (Windows) or SketchUp > License (Mac) to see your serial number. Important Note on "Free" License Keys Search your inbox for "SketchUp License" or "Trimble"
This article addresses the common questions and misconceptions surrounding and the transition to newer versions like SketchUp 2021 . The Evolution of SketchUp Licensing Search your inbox for "SketchUp License" or "Trimble"