New users can no longer purchase "Classic" perpetual licenses for any version. Trimble has moved entirely to a subscription model accessible via a Trimble ID Are you trying to recover a lost serial number or are you looking to an existing 2017 license to a modern subscription?
If you are searching for the keyword you are likely part of a specific group of users. You either own a legacy license and need to reinstall it on a new machine, or you are looking to purchase a used license to avoid the recurring fees of the modern SketchUp subscription. license sketchup 2017
SketchUp 2017 is a time capsule of perfect balance—powerful enough for professional work, permanent enough to outlive the subscription era. Treat your license key like gold, because they don't make them like this anymore. Introduction New users can no longer purchase "Classic"