Ensure you are on the Classic tab, not the Subscription tab.
SketchUp 2020 marks a significant turning point in the software's history, as it was the final version to offer the "Classic" perpetual license alongside the then-new subscription model. For many users, this version remains a staple for 3D modeling, but managing its credentials can be tricky if you are transitioning between devices or recovering an old installation. 1. Where to Find Your License Information Sketchup 2020 License Key And Authorization Number
If you still have SketchUp installed on a working computer, you can view your serial number directly by navigating to Help > License (Windows) or SketchUp > License (Mac). Ensure you are on the Classic tab, not the Subscription tab
This was designed to prevent software piracy. If a user purchased a single license (one seat), they could theoretically copy the License Key to a second computer. However, when the second computer requested authorization, the server would see that the single seat was already occupied by the first computer (identified by its unique hardware fingerprint). The server would then deny the request, refusing to generate a second Authorization Number. If a user purchased a single license (one
: Does not use keys or codes. Authorization is handled solely by signing in with your Trimble ID (email and password). Authorization Process for Classic Licenses
On the "Welcome to SketchUp" window, click Add Classic License .