Are you trying to recover a lost key for an existing installation, or

Are you receiving a specific during activation?

Common issues with license keys and authorization numbers include:

Click Add License to finalize. The status should change to "Licensed" or "Active." Navigating the Risks of "Free" License Keys and Cracks

Websites claiming to offer free authorization numbers are prime delivery systems for malware. Downloading activation tools can infect your computer with ransomware, keyloggers, or spyware that steals personal data. Legal and Compliance Issues

For those needing to activate on multiple machines (such as in an educational or lab environment), SketchUp supports activation through an activation_info.txt file. This plain text file should contain the following format:

Using pirated software for commercial architecture, engineering, or design projects exposes your business to massive financial penalties during software compliance audits.

When Trimble sold SketchUp 2017, they issued "Classic Licenses." Understanding how these legacy licenses behave today is critical if you are trying to manage an old installation: