Once you have your (typically starts with "S") and Authorization Code , follow these steps:
If you still have your serial number but lost the authorization code, you can use the official SketchUp License Manager to have the info resent. Sketchup 2017 License Key And Authorization Number
Trimble officially ended support for 2017 in January 2023. While your perpetual license still works, features like the 3D Warehouse or Extension Warehouse may no longer function within the 2017 interface. Once you have your (typically starts with "S")
If the software is already installed and working on an old computer, go to Help > License (Windows) or SketchUp > License (Mac) to view your active serial number. Steps to Authorize SketchUp Pro 2017 If the software is already installed and working
Copy and paste your Serial Number and Authorization Code exactly as they appear in your email.
Requires a paid "Classic License" (serial number and authorization code) for commercial use.