Using unauthorized or pirated license keys and authorization numbers can lead to:
To activate SketchUp Pro 2020 using these credentials, you must follow these steps: Authorizing or Removing a License | SketchUp Help
Click on Add Classic License (or just Add License depending on your screen).
If you're looking for a free trial or have questions about upgrading, consider visiting the official SketchUp support pages for more information.
(e.g., a desktop and a laptop), though you cannot use both simultaneously. Offline Capability