To retrieve or activate a SketchUp Pro 2015 classic license , you must use the original serial number and authorization code provided at the time of purchase. SketchUp Pro 2015 is a "classic" (perpetual) version, and its licensing system differs from the modern subscription-based login used in current versions. How to Find Your License Details
by entering the email address associated with the original purchase. Existing Installation sketchup pro 2015 serial number and authorization code 52
Once you've obtained your serial number and authorization code, you can activate SketchUp Pro 2015 and start using its features, including: To retrieve or activate a SketchUp Pro 2015