If you are using a standalone license, it may need to be reactivated:
The most immediate fix is ensuring your machine's date matches the current actual date. license not recognized error 30 etabs 2016
Navigate to the ETABS installation folder and locate lsdecode.exe . Run it to check your current license type and expiration. If you are using a standalone license, it
Set the date to a time when the license was known to be valid (e.g., 2017 or 2018). Set the date to a time when the
Place this file in the ETABS 2016 installation folder to help the software find the license server faster.
The lservrc file, which stores the license information, may be incomplete or damaged. Step-by-Step Fixes for Error 30 1. Verify and Sync System Date
Run WechoID.exe in the ETABS folder to confirm your computer recognizes the Computer ID. 5. Network License Troubleshooting