: 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
: 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 sketchup pro 2018 add license key
Locate your license email. For the 2018 version, the serial number should begin with the letter Copy and paste the Serial Number Authorization Code : You might see a message claiming you
exactly as they appear in your email into the respective fields. Add License to activate your software. Troubleshooting Common Issues "Offline" Error While your 2018 perpetual license should still work,
: Ensure your key is specifically for 2018. A key for 2019 (starting with "U") will not work on the 2018 version. Seat Limit