What (Windows or macOS version) are you running?
If you previously purchased SketchUp 2016 Pro, your license information is not lost. You can usually recover it through these methods:
This is a separate, unique string of characters provided at the time of purchase that validates your specific serial number. sketchup 2016 license key and authorization code
The appeal of a free, lifetime license is a dangerous trap. The risks far outweigh the benefits.
These two components are required to move from the 30-day trial period to a fully licensed Pro version. 2. Authorized Ways to Get Your License Information What (Windows or macOS version) are you running
If you cannot find the email, you can use the official SketchUp License Manager .
If you have an old workstation where SketchUp 2016 is still active, you can find the serial number directly within the application interface: The appeal of a free, lifetime license is a dangerous trap
Click Add License or Activate . The software will validate the mathematical pairing of the two codes and unlock the Pro features.
That said, if you're looking to use SketchUp 2016 legally, here are some authorized paths:
Ensure you downloaded SketchUp 2016, not 2017 or 2015.