A single-user "Classic" license allows for installation on up to two devices
In this guide, we will break down how the licensing system worked for this version and what your options are today. Understanding the SketchUp 2016 Licensing System sketchup 2016 license key and authorization code
Disclaimer: Attempting to use illegitimate or pirated key generators can lead to malware infections and violated licensing agreements. A single-user "Classic" license allows for installation on