There are several ways to obtain a serial number and authorization code 52 for SketchUp Pro 2015:
If you have lost your original license information, you can retrieve it through these methods: Check Confirmation Emails : Search your inbox for messages from sketchupmail@sketchup.com or your local reseller. SketchUp License Manager : You can use the SketchUp License Manager sketchup pro 2015 serial number and authorization code 52
Look for messages from sketchupmail@sketchup.com containing your purchase details. There are several ways to obtain a serial