If you are already in the program, go to the top menu and select Help > License > Authorize (Windows) or SketchUp > License Enter Your Details
: A single-user license can typically be authorized on up to two devices
: Ensure your key is specifically for 2018. A key for 2019 (starting with "U") will not work on the 2018 version. Seat Limit sketchup pro 2018 add license key
: Be aware that Trimble ended support for "Classic Licenses" in 2020. While your 2018 perpetual license should still work, web-based features like the 3D Warehouse
Locate your license email. For the 2018 version, the serial number should begin with the letter Copy and paste the Serial Number Authorization Code If you are already in the program, go
: You might see a message claiming you are offline even when connected. If this happens, click "Advanced" in the license dialog to attempt activation. Version Mismatch
may no longer be accessible directly within the 2018 interface. SketchUp Community SketchUp Pro 2018 - Add-License While your 2018 perpetual license should still work,
exactly as they appear in your email into the respective fields. Add License to activate your software. Troubleshooting Common Issues "Offline" Error