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: Trimble officially ended support for SketchUp 2017 and older versions. You can no longer authorize these versions on new machines through the standard online activation process if you are attempting to move a license for the first time without a valid maintenance plan. Alternatives and Current Versions sketchup 2017 pro license key
Trimble officially stopped selling perpetual "Classic" licenses (the kind that used a serial number and authorization code) in November 2020 Activation Barriers: Search for "SketchUp License" or "Trimble" in your inbox