SketchUp Pro 2021 was a transitional version in Trimble's licensing history. It was one of the last versions to support the "Classic" perpetual license for users who had active Maintenance & Support (M&S) plans at the time, though the company officially shifted to a subscription-only model in November 2020. Licensing Options for SketchUp Pro 2021
The release of SketchUp Pro 2021 marked a major turning point in how Trimble handles licensing. This was the final version of the software where Classic Perpetual Licenses (using a serial number and authorization code) were widely supported before the industry-wide move toward subscription-based models. Sketchup Pro 2021 License
"Too Many Activations": SketchUp Pro allows for two simultaneous installs. If you've reached the limit, you must sign out of an old device via the Trimble Account Management portal. SketchUp Pro 2021 was a transitional version in
Before activating your license, ensure you have the correct version installed: This was the final version of the software
Requirements: Ensure your system has at least 8GB of RAM and a 3-button scroll-wheel mouse.