If you cannot find your key, authorized users can access the CSI Customer Center to retrieve installation links and licensing details.
If your official activation key isn't working, check these common fixes: activation key for standalone license etabs 2020 top
Run the installation executable (e.g., ETABSv2020LegacySetup.exe ). When prompted for the license type, select . Enter your Activation Key when asked. If you cannot find your key, authorized users